Bloodtinged Blademaster —
Creature — Vampire Samurai
First strike
When you sacrifice Bloodtinged Blademaster, if it didn't have a +1+/1 counter on it, return it to the battlefield with a +1/+1 counter on it.
Those who seek to study the ways of the bloodthirsty blade need only learn to channel its hunger. In the hands of a master, it draws no blood at all.
2/2

Airasilev, Avenger of Valakut —
Legendary Creature — Elemental Knight
Airasilev, Avenger of Valakut gets +1/+1 and has indestructible as long as you sacrificed a permanent this turn.
Airasilev gets +1/+1 and has haste as long as an opponent has taken damage this turn.
5/4

El Dorado
Legendary Land
El Dorado enters the battlefield tapped.
: Add .

Seems to good. I mean, etb tapped duals all have an upside now, but I don't feel we're ready for this. Tri lands are still considered pretty good.

Walking Watchtower
Artifact Land Creature — Construct
Vigilance
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
: Add .
0/2

Wild Frenzy —
Instant
Creatures you control gain haste and vigilance until end of turn.

I designed this for Libe's contest, but it didn't fit the criterion.

Crown of the Five Kings —
Legendary Enchantment — Aura
Enchant creature
Enchanted creature has flying, first strike, vigilance, lifelink, and indestructible.
"The realm was shaped like a diamond, with Wyndmoor to the north, Direholm to the south, Renzadorn to the west, and Thelladyne to the east. At the center of these was Gandervell, with its king holding sway over all the other four. But when the hellbeasts invaded from below, the five kingdoms were forced to ally their forces, and became greater than the sum of their parts."
—Glory of the Ages, Volume III

Bookwurm —
Creature — Wurm (R)
Whenever you scry Bookwurm, you may put it onto the battlefield under your control instead of back into your library.
4/5

That's a wonderful name for a card! I would be really worried about power level, though.

yeah, i only made it red because they're the secondary scry color and green because it's a Wurm, but mechanically it should probably be a 2/2. Still feels green enough to warrant a second color because of things like mystic snake where green helps blue make dudes for doing blue things. can Wurms be smol?

Bookwurm —
Creature — Wurm Illusion
Whenever you scry Bookwurm, you may put it onto the battlefield.
2/2

If I make it an Illusion, the 2/2 part doesn't feel so incongruous. You could throw hexproof on there if you're feeling gutsy but it's not necessary.

also hey why the heck hasn't this boi been made yet:

Germinate —
Instant
Convoke
Create a 1/1 green Saproling creature token.

like, really, what the heck wizards

If it's a 2/2, it could just be a Bookworm. There are worms in Magic. But that doesn't really have the allure that Bookwurm has.

Yeah you prolly just want to make it cost something to play it from scry.

Forbidden Pact —
Tribal Sorcery — Demon (R)
Draw three cards.
At the beginning of your next end step, you lose the game.
A bargain forged in blood and shadow.

Goblin Librarian —
Creature — Goblin Advisor (U)
After you shuffle your library, you may scry 2.
To outsiders, the place may seem to be a total mess, but to him, every discarded scrap of paper is exactly where it needs to be.
2/2

Probably can't be printed due to it making Mind's Desire take approximately 4-6 business days to resolve, but i still thought it was cute.

Inspired by the card i bumped the Unnatural thread with.

Lucky Strike —
Enchantment
At the beginning of your upkeep, if your life total is exactly 7, you win the game.
"Five percent of the time, it works all the time."
—Krark

Void Snatcher —
Creature — Illusion (U)
Shadow
When Void Snatcher enters the battlefield, return target creature without shadow to its owner's hand.
“Nothing in the shadows but the shadow-hands
Reaching out to sad young frightened men;
The loneliest people in the whole wide world
Are the ones you're never going to see again.”
—John Darnielle, Harlem Roulette
1/1

Yawgmoth's Pactsealer —
Artifact Creature — Horror (R)
When Yawgmoth's Pactsealer enters the battlefield, you get an emblem with "Skip your draw step."
Gix looked back on his moment of glory with an eternity of regret.
9/9

Amyreus, Avenger of Aeons —
Legendary Creature — Archon Ally (R)
Flying, hexproof, lifelink, haste, trample
"So surely as the sun shall set
And moon shall rise and givers get
Shall vicious hearts be laid to rest
And with their blood his blade left wet."
—Chronicle of Aeons 3:37-40
4/4

Love that flavour text.
Weird that it's an ally. Also that it's an archon.
I like when 5 color, cmc 5 cards are 5/5, but you may have made a good call keeping it at 4/4.

Momir's Masterpiece —
Creature — Mutant Avatar (U)
Graft 1, evolve
The work is complete.
0/0