Prodigal Blademaster
Creature - Human Warrior
~ gets +X/+0, where X is equal to twice the total converted mana cost of equipment attached to ~.
2/1

Vampiric Armour
Artifact - Equipment
Equipped creature gets +3/+3 and has lifelink
Whenever equipped creature attacks or blocks, put a blood counter on ~ and it deals damage to equipped creature equal to the number of blood counters on it.
Equip

Unraveler
Creature - Human Druid
Whenever ~ blocks or becomes blocked by a creature, destroy all equipment and auras attached to that creature.
2/2

Avenging Armour
Artifact - Equipment
Whenever equipped creature is dealt damage, put that many charge counters on ~.
Equipped creature gets +X/+2, where X is the number of charge counters on ~.
Equip

Sonic Shield
Artifact - Equipment
Whenever a creature blocks or becomes blocked by equipped creature, remove that creature from combat and ~ deals 3 damage to it.
Equip

Fencer's Blade
Artifact - Equipment
Equipped creature has double strike.
Whenever equipped creature deals combat damage to a creature, that creature gets -X/-0 until end of turn, where X is equipped creature's power.
Equip

Shadow Blade
Artifact - Equipment
Equipped creature gets +2/+1
: You may cast a creature card from your hand. When it enters the battlefield, attach ~ to it.
Equip

Mask of Madness
Artifact
Equipped creature has double strike and base toughness 1.
Equip

Pro blademaster - Doubling (multiple) cmc's is complicated, but doable. That's really the only mark against this.
Vampiric Armor - With The toughness boost, I think the downside may take too long to be relevant. In EDH it would work fine, but in most formats it's just +3/+3 and lifelink on the cheap.
Unraveler - That's a good hate bear! I'm kind of surprised this isn't a thing.
Avenging Armour- I'd drop the armor concept and make it a weapon, or gauntlets or something. The toughness boost just kind of muddies the concept. I like the idea of equipment that starts out useless and gets progressively better. Without the toughness boost you have to worry about loosing your damage sponges, so the cost could drop without it.
Sonic Shield - This is thew first one I don't like. It's like a complicated protection from creatures- they can never hurt you, but you can hurt them, but the amount's not dependant on your power.
Fencer's Blade - I feel the name has to reference the risk involved here. Double-Edged Dual Swords? Yeah, that's it. Oh, it's minus X. That's a pretty good way to make use of double strike. Ouch. Wither's a good pair too come to think of it.

Shadow Blade - Wording's unclear. Do you play the creature without paying the regular cost? If not, then I think you're better off using a "2: the next time a creature would enter the battlefield under your control this turn..." or "Whenever a creature enters the battlefield under your control, you may pay...". Is it supposed to let you cast that creature as though it had flash?
An equipment that only works that way might be a neat angle to explore.
Mask of Madness - I don't see how a mask gives you double strike. That's a fine pairing of abilities... ability and stat? It is a good card mechanically is what I am trying to say.

Mask of Madness is a design from DotA. In game the item increases attack speed and the damage you take

Godfire
Sorcery
Kicker and/or
If ~ was kicked with its kicker, it has lifelink. If ~ was kicked with its kicker, it has deathtouch.
~ deals 2 damage to each creature.

Devour
Sorcery
Destroy target creature. Put a +1/+1 counter on up to one target creature you control.

Yuu and Chi
Legendary Creature - Human Scout
Whenever you cast a blue spell, draw a card.
Whenever you cast a green spell, you gain 6 life.
6/6

Acolyte of Ru
Creature - Human Cleric
Put a -1/-1 counter on ~: ~ gains first strike and deathtouch until end of turn.
2/2

Acolyte of Trog
Creature - Human Berserker Cleric
You can't cast noncreature spells.
, discard a noncreature, nonland card: ~ deals 4 damage to target creature or player.
4/4

Acolyte of Fedhas
Creature - Human Cleric
Whenever a nontoken creature dies, exile it and create a 0/1 green plant creature token.
: Put five +1/+1 counters on target plant creature without any +1/+1 counters on it.
5/5

Acolyte of Ashenzari
Creature - Human Cleric
Each opponent plays with their hand revealed.
When ~ enters the battlefield and 1t the beginning of your upkeep, name a nonland card.
Whenever an opponent plays a card with the last name chosen, put a +1/+1 counter on ~.
2/2

Acolyte of Dithmenos
Creature - Human Cleric
Skulk, hexproof, deathtouch
2/2

Acolyte of Okawaru
Creature - Human Soldier Cleric
Whenever a creature dealt damage by a creature you control this turn dies, put 2 +1/+1 counters on ~.
3/3

Acolyte of Vehumet
Creature - Human Cleric
Whenever a spell you control deals damage to one or more creature or players, draw a card.
4/4

Acolyte of Elyvilon
Creature - Human Cleric
, : Prevent the next X damage that would be dealt to each creature you control this turn. You gain X life.
3/3

Acolyte of Makhleb
Creature - Human Cleric
Spells and other permanents you control have lifelink.
Whenever you gain life, ~ deals that much damage to target creature or player.
6/6

Acolyte of Sif Muna
Creaure - Human Wizard Cleric
Whenever you cast an instant or sorcery spell, put a charge counter on ~.
: Add one mana of any color to your mana pool for each charge counter on ~.
3/3

Enemy colored planeswalker cycle.

Yaril, the Biting Cold
Legendary Planeswalker - Yaril
{+1} Tap up to one target creature, and ~ deals 1 damage to it. It doesn't untap during its controller's next untap step.
{-1} Draw two cards, then discard a card.
{-7} You get an emblem with "Creatures your opponents control don't untap during their controller's untap step."
{4}

Maya, the Cauterizer
Legendary Planeswalker - Maya
Lifelink
{+1} ~ deals 1 damage to each other creature, player, and planeswalker.
{-3} ~ deals 4 damage to target creature or player.
{-6} You get an emblem with "if a source you control would deal damage, it deals that much damage plus 5 instead."
{4}

Uri, the Iron Will
Legendary Planeswalker - Uri
{+1} Up to one target creature gains indestructible until your next turn.
{-1} Create a 1/1 black and white spirit creature token with flying.
{-7} You gain an emblem with "Creatures you control have deathtouch, and whenever a creature you control deals combat damage to a player, that player loses the game."
{3}

Bastor, Law of Nature
Legendary Planeswalker - Bastor
{+1} Put a +1/+1 counter on up to one target creature.
{-2} Destroy target creature if it has the least power or is tied for least power among creatures on the battlefield.
{-7} You get an emblem with "Creatures you control get +2/+2, and creatures your opponents control get -2/-2"
{3}

Alex, the Archaeologist
Legendary Planeswalker - Alex
{+1} Put the top three cards of your library into your graveyard, then return up to one land card from your graveyard to your hand.
{-2} Target instant or sorcery card in your graveyard gains flashback until end of turn. Its flashback cost is equal to its mana cost.
{-7} Return all cards from your graveyard to your hand. You get an emblem with "you have no maximum hand size."
{3}

Yaril seems alright. I just hope nobody uses the ult without a way to capitalize on it and close out the game.

I like the idea of a planeswalker with a keyword ability. It's just too bad that so few keywords do anything for walkers.
I also like the single target burn/ sweeper dynamic.
Maya's +1 might be overpowered. In a multiplayer setting it's a 1/3 card combo for ~15 life a turn.

Uri's a sleek design. Very cohesive.

Bastor's second ability is neat, but might be too niche. It's a good fit with the 1st ability. The ultseems a little weak.

Alex is alright but lacks a starting loyalty.

Lyria, the Windrider
Legendary Planeswalker - Lyria
{+1} Until your next turn, creatures you control with flying get +1/+1 and have vigilance.
{-1} Return target tapped creature to its owner's hand.
{-6} Create ten 1/1 blue and white bird creature tokens
{3}

The Librarian Reborn
Legendary Planeswalker - Librarian
{+1} Scry 1
{-1} Target player draws a card and loses 1 life.
{-4} Search your library for a card and put it into your hand, then shuffle your library.
{2}

Tibalt, Demon-Bound
Legendary Planeswalker - Tibalt
{+1} Each player draws a card, and Tibalt deals 2 damage to each player.
{-3} Tibalt deals damage to target creature equal to the number of cards in its owner's hand.
{-7} Target player draws 7 cards. At the beginning of that player's next end step, Tibalt deals 1 damage to that player for each card in their hand.
{3}

Tiana, the Stampede
Legendary Planeswalker - Tiana
{+1} Creature spells you cast this turn enter the battlefield with a +1/+1 counter on them.
{0} Create a 3/3 red and green beast creature token with trample and haste. Sacrifice it at end of turn.
{-6} You gain an emblem with "whenever a creature enters the battlefield under your control, each creature you control gets +X/+X and gains trample until end of turn, where X is its power".
{3}

Roslo, Strand of Life
Legendary Planeswalker - Roslo
{+1} Remove all -1/-1 counters from up to one target creature you control. You gain life equal to its power.
{+0} Each creature you control gains persist until your next turn.
{-6} Return each creature card from your graveyard to the battlefield with a -1/-1 counter on it.
{4}

Lyria's +1 is an anthem plus evasion that lets the walker protect itself. That seems like too much for a + effect at 3 mana. Otherwise I like the card.
Edit- Oh, it gives the buff to creatures that already have flying. Never mind.

I remember another Librarian from this thread. He was only born once though, so this must be a different guy.
I like it. It's in a good place power wise. A better 2 mana walker than Tibalt certainly.

Speak of the devil. I didn't know there would be a new Tibalt when I wrote the above. Spooky.
I feel like the -3 could be a -2 given that it can't kill big creatures or aggro players.
It would be cool if the ult instead gave multiple Phyrexian Arena emblems.

Was Tiana one of the beast legends? Or am I just getting paranoid.
It's probably safe to let the + ability effect tokens too.

First line of Roslo reads weirdly before you see the rest of the card.
The +0 looks fun. You can save every creature once with the +0, and keep saving a favourite with the +1.

Herald of Champions
Creature - Angel
Flying
When ~ enters the battlefield, search your graveyard and/or library for a planeswalker or legendary creature card, reveal it, and put it into your hand. Shuffle your library if it was searched this way.
4/4

Herald of Despair
Creature - Angel Skeleton
Flying
When ~ enters the battlefield, return target legendary creature or planeswalker card from your graveyard to the battlefield.
4/4

Herald of Might
Creature - Angel
Flying
When ~ enters the battlefield, choose one:
-Put four +1/+1 counters on target legendary creature.
-Put four loyalty counters on target planeswalker.
4/4

Herald of Duplicity
Creature - Angel Shapeshifter
Flying
You may have ~ enter the battlefield as a copy of any legendary creature or planeswalker on the battlefield, except its name is still ~.
4/4

Herald of Hellfire
Creature - Angel Devil
Flying
When ~ enters the battlefield, it deals damage to target creature or player equal to the greatest converted mana cost among legendary creatures or planeswalkers you control.
4/4

Cartography
Sorcery
Draw two cards. You may play two additional lands this turn.

Spreading Flame
Sorcery
~ deals X damage divided as you choose between target player and up to one target creature.

Fungal Snapper
Creature - Turtle
Whenever ~ is dealt damage, put a +1/+1 counter on it.
1/4

Bisect
Instant
Choose one:
-Target player sacrifices a creature with an even converted mana cost
-Target player sacrifices a creature with an odd converted mana cost

Thoughtrender
Creature - Human Cleric
, : Target opponent discards a card. Activate this ability only during your turn. If that player can't, untap ~ and transform it.
1/1
----------------
Soulrender
Creature - Demon
Flying
~ gets -1/-1 for each card in an opponent's hand.
7/7

I like basically all of those. I like Spreading Flame a lot and am surprised it hasn't been done by Wizards before. I don't like the name though, Spreading sounds as if it is going across the battlefield, maybe Piercing?

Avatar of Depression
Creature - Avatar
Flying
Whenever a creature attacks you or a planeswalker you control, that creature doesn't untap during its controller's next untap step.
4/4

Avatar of Mania
Creature - Avatar
Haste
At the beginning of your upkeep, discard your hand and draw seven cards.
5/5

Avatar of Psychosis
Creature - Avatar
Menace
At the beginning of your upkeep, reveal your hand and and exile all creature cards, then return each other creature you control to its owner's hand, then return each creature card in your graveyard to the battlefield, then put each card exiled this way into its owner's graveyard.
6/6

Sad card.
High variance card.
Delusional card.

Bad day? There's always people here you can talk to.

Avatar of Mania's ability hasn't been seen on a creature before has it? Not a bad card.

Avatar of mania is a lot like Damia, Sage of stone I suppose, and kind of like Avaricious Dragon

It's the kind of creature they need to print more tbh

Oooo I like Cartography and Bisect.

I'd run Cartography in my Radha, Heir to Keld EDH deck.

Song of Love and Hatred
Instant
Prevent all damage that would be dealt to target creature or player this turn.
~ deals 4 damage to target creature or player.

Commoner's Cause
Instant
Destroy up to target creature with power 4 or greater.
Creatures you control get +1/+1 until end of turn.

Strange Transformation
Instant
Destroy target creature. Its controller searches their library for a creature card with a different name and converted mana cost less than or equal to it and puts it onto the battlefield, then shuffles their library. Draw a card.

Unholy Rites
Enchantment
At the beginning of your end step, you may sacrifice a creature and gain life equal to its toughness.
At the beginning of your upkeep, if you have 30 or more life, return target creature card from your graveyard to the battlefield and you lose life equal to its toughness.

Mayfly Mimic
Creature - Shapeshifter
Flash
You may have ~ enter the battlefield as a copy of any creature on the battlefield, except it has haste and "At the beginning of your end step, sacrifice this creature."
0/0

A Believing Heart
Instant
Draw two cards, then prevent the next X damage that would be dealt to target creature or player this turn, where X is the number of cards in your hand.

Descent into Hell
Instant
Choose X:
-Tap each creature you don't control. They don't untap during their controller's next untap step.
-~ has wither
-~ deals 1 damage to each creature you don't control.
Then ~ deals 2 damage to each creature you don't control.