Nature Scribe
Creature ─ Human Wizard (C)
, sacrifice Nature Scribe: Add three mana of any color. Spend this mana only to active abilities of creatures.
1/1
He gave everything for this work.

Stout Beast-Trainer
Creature — Dwarf Ranger (U)
Ward
: Add one mana of any color. Spend this mana only to activate abilities of creatures.
Whenever you activate an ability of another creature you control, put a +1/+1 counter on it. This ability triggers once per turn.
1/3

Master of Beasts
Creature ─ Elf Druid (R)
Ward ─ Put a creature card from your hand onto the battlefield under Master of Beasts controllers control.
At the beginning of your end step, put a creature card from your hand onto the battlefield.
1/1
He died with a sting on his neck, a bite on his leg, claw marks on his back, poison in his veins and a smile on his face.

Both of our cards should be hybrid.

Oops and fixed!

Kiora of Zendikar's Waves
Legendary Creature — Merfolk Druid (M)
Flash
When Kiora of Zendikar's Waves enters the battlefield, it explores.
Whenever a Kraken, Leviathan, Octopus, or Serpent attacks, you may exile Kiora and return her to the battlefield transformed.
In secret, Kiora prayed to Cosi, the trickster god. In time, she would learn the truth of the 'gods'.
1/1

Kiora of the Multiverse's Depths
Legendary Planeswalker — Kiora
: Untap target creature or land you control. It gains hexproof and indestructible until end of turn.
: Create a 3/3 green and blue Serpent creature token.
: Surveil 8, then draw two cards. This ability costs + more to activate, where X is the greatest power among Krakens, Leviathans, Octopi, and Serpents you control.

Colorless/Lands

Burnwillow Altar
Land (C)
Favor - ~ enters the battlefield tapped unless you call its favor. When you do, sacrifice it at the beginning of your next upkeep unless you pay .
: Add or

Mystic Vale
Land (U)
When Mystic Vale enters the battlefield, reveal your hand. If you reveal any nonland cards with mana value 3 or less, Mystic Vale enters the battlefield tapped.
: Add or .

Not sure I worded that correctly.

Quatlez's Temple
Land - Swamp Forest (R)
~ enters the battlefield tapped unless you paid a favor cost this turn.
Whenever you pay a favor cost, you get a favored counter. Then, if you have 20 or more favored counters, you wim the game.

Valley of the Lotus
Legendary Land (M)
Whenever you cast a colored spell, put a colored counter on Valley of the Lotus that shares a color with that spell that is not already there.
: Add .
: Add a mana of each color that shares a color with a counter on Valley of the Lotus.

Altruistic Motive
Enchantment — Aura (C)
Enchant creature
Enchanted creature gets +1/+1 and has lifelink.
If you would create a Clue token, you may pay instead. If you do, return Altruistic Motive from your graveyard to the battlefield.
"Yes, I did it! And I'd do it again! He was going to shut down the foundry and the whole town would be out of the job!"

Boon of the Ancients
Enchantment (U)
When Boon of the Ancients enters the battlefield, put X +1/+1 counters on target creature.
Whenever you put a +1/+1 counter on a creature, gain that much life.

Courage Under Fire
Enchantment (R)
This spell has flash if an opponent cast a spell that targeted you or a creature you control this turn.
This spell costs less to cast for each creature attacking you or a planeswalker you control.
Creatures you control get +1/+1.

Dire Need
Enchantment (M)
Your starting life total is 100.

I'm guessing that design was intended to be mythic, Dudibus?

Blue

Eavesdrop
Instant (C)
Look at target opponent's hand and secretly choose a nonland card shown this way.
Until end of turn, when that opponent casts the chosen spell, reveal your choice. If you do, draw a card.
Draw a card.

Oops yes.

Planted Evidence
Artifact — Clue (U)
Planted Evidence enters the battlefield under the control of an opponent of your choice.
Whenever a creature controlled by Planted Evidence's owner becomes the target of a spell or ability you control, counter that spell or ability unless you pay .
, Sacrifice Planted Evidence: Planted Evidence's owner draws a card.

The Ghost of Molly McGee
Legendary Creature - Spirit (R)
Flying, ward - mill 20 cards.
1/1
Such a small thing to instill such a sense of loss.

Exclusivity Contract

Sorcery (M)
Gain control of target creature or planeswalker. Search its controller’s graveyard, hand, and library for any number of cards with the same name as that permanent and exile them. That player shuffles, then draws a card for each card exiled from their hand this way.
"Those who say that loyalty cannot be bought simply don't have the necessary wealth." —Lord Xander

Raw Materials
Sorcery (C)
Target opponent discards a card. If it was a creature card, create a 2/2 black zombie creature token.
"The living are flesh, not fresh." ─ Chapter 1, Grave Thoughts ─ Necromancer Self Help.