Spontaneous Mutation

Flash
Enchant creature
Enchanted creature gets -X/-0, where X is the number of cards in your graveyard.

Reclamation Sage

When this creature enters, you may destroy target artifact or enchantment.

Reclamation Sage

When this creature enters, you may destroy target artifact or enchantment.

Foundry Hornet

Flying
When Foundry Hornet enters, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn.

Glint-Nest Crane

Flying
When Glint-Nest Crane enters, look at the top four cards of your library. You may reveal an artifact card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Veteran Motorist

When Veteran Motorist enters, scry 2.
Whenever Veteran Motorist crews a Vehicle, that Vehicle gets +1/+1 until end of turn.

Master Thief

When Master Thief enters, gain control of target artifact for as long as you control Master Thief.

Skred

Skred deals damage to target creature equal to the number of snow permanents you control.

Supernatural Stamina

Until end of turn, target creature gets +2/+0 and gains “When this creature dies, return it to the battlefield tapped under its owner’s control.”

Champion of Lambholt

Creatures with power less than Champion of Lambholt’s power can’t block creatures you control.
Whenever another creature you control enters, put a +1/+1 counter on Champion of Lambholt.

Mana Echoes

Whenever a creature enters, you may add an amount of equal to the number of creatures you control that share a creature type with it.

Fortify

Choose one —
• Creatures you control get +2/+0 until end of turn.
• Creatures you control get +0/+2 until end of turn.

Supernatural Stamina

Until end of turn, target creature gets +2/+0 and gains “When this creature dies, return it to the battlefield tapped under its owner’s control.”

Fortify

Choose one —
• Creatures you control get +2/+0 until end of turn.
• Creatures you control get +0/+2 until end of turn.

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent’s controller may pay . If the player does, they may copy this spell and may choose a new target for that copy.

Sylvan Ranger

When Sylvan Ranger enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Moment of Heroism

Target creature gets +2/+2 and gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Champion of Lambholt

Creatures with power less than Champion of Lambholt’s power can’t block creatures you control.
Whenever another creature you control enters, put a +1/+1 counter on Champion of Lambholt.

Aggressive Urge

Target creature gets +1/+1 until end of turn.
Draw a card.