Whenever you gain life, you may pay . If you do, put a +1/+1 counter on target creature for each 1 life you gained.

Toxic 1
When this creature dies, create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This token can't block."

At the beginning of each upkeep, put a strife counter on this enchantment.
Attacking creatures get +1/+0 for each strife counter on this enchantment.
Blocking creatures you control get +1/+0 for each strife counter on this enchantment.

Other Horses you control have indestructible.
At the beginning of each end step, if you gained life this turn, create a 5/5 white Horse creature token.

Changeling
Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

Protection from red
: Target creature gains protection from red until end of turn.

Choose one —
• Destroy all tokens.
• Destroy all nonland, nontoken permanents.

: This creature deals 1 damage to target attacking or blocking creature.

Other white creatures get +1/+1.
Nonwhite creatures get -1/-1.
Pay 2 life: Return Crovax to its owner's hand.

: Tap target creature.
: This creature gets +0/+5 until end of turn.

: Target creature you control that's attacking alone gets +1/+0 until end of turn. You gain 1 life.

Enchant creature
Enchanted creature has protection from black and from red.
Sacrifice this Aura: Enchanted creature and other creatures that share a creature type with it gain protection from black and from red until end of turn.

Defender
Morph

Gift a Food (You may promise an opponent a gift as you cast this spell. If you do, they create a Food token before its other effects. It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")
Target creature you control gets +2/+2 until end of turn. If the gift was promised, that creature also gains indestructible until end of turn.

White creatures get +1/+1.

Protection from black
This creature gets +1/+1 for each Swamp your opponents control.

Choose one or both —
• Exile target artifact.
• Exile target enchantment.

Defender
You have hexproof.
Prevent all noncombat damage that would be dealt to other creatures you control.

Flying, vigilance

Equipped creature gets +1/+1.
: Exile this Equipment, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery.
Equip

Mutate
Lifelink
Whenever this creature mutates, create two 1/1 white Cat creature tokens with lifelink.

Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gains lifelink until end of turn.

When this creature enters, each creature target opponent controls loses all abilities, becomes a Coward in addition to its other types, and has base power and toughness 1/1.

When this creature dies, you gain 3 life.
, Sacrifice this creature: Destroy up to one target artifact or enchantment.

The first Merfolk spell you cast each turn has convoke.
At the beginning of your end step, if you control two or more tapped creatures, conjure a card named Stonybrook Schoolmaster onto the battlefield tapped.

Enchant player
Nonlegendary creatures enchanted player controls have base power and toughness 3/3 and lose all creature types.

Enchant player
Enchanted player can't cast more than one spell each turn.

Enchant player
As this Aura enters, choose a card name.
Spells with the chosen name enchanted player casts cost more to cast.
Whenever enchanted player casts a spell with the chosen name, you may sacrifice this Aura. If you do, draw a card.

Enchant player
Whenever a creature attacks enchanted player, its controller gains 1 life.

Enchant player
Whenever enchanted player is attacked, you gain 2 life. Each opponent attacking that player does the same.