Whenever an opponent casts a spell, that player sacrifices a permanent of their choice unless they pay .

Flying, first strike

Kicker (You may pay an additional as you cast this spell.)
When this creature enters, if it was kicked, return target artifact card from your graveyard to your hand.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, each player loses 2 life.

Rally — Whenever this creature or another Ally you control enters, creatures you control get +2/+2 until end of turn.

Defender
When this creature enters, you may return target instant or sorcery card from your graveyard to your hand.

Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life.

Flying
Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life.

Reach
Domain — When this creature enters, it deals damage to each opponent equal to the number of basic land types among lands you control.

Destroy all creatures target player controls. For each creature that died this way, that player creates two 1/1 red Goblin creature tokens.

Destroy target nonblack creature. Create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add ."

Instant and sorcery spells cost less to cast.

Whenever a creature attacks, you gain 1 life.

: Turn this creature face down.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When this creature is turned face up, copy target instant or sorcery spell. You may choose new targets for that copy.

Changeling (This card is every creature type.)
Trample

This creature gets +3/+3 as long as you control no untapped lands.

Trample
This creature enters with four +1/+1 counters on it.
Whenever this creature attacks, double the number of +1/+1 counters on each creature you control.

Trample
When this creature enters, distribute four +1/+1 counters among any number of target creatures you control.

When this creature enters, create a 3/3 colorless Phyrexian Golem artifact creature token.
Golem creatures you control have vigilance.

Living weapon (When this Equipment enters, create a 0/0 black Phyrexian Germ creature token, then attach this to it.)
Equipped creature gets +4/+4 and has vigilance and lifelink.
: Return this Equipment to its owner's hand.
Equip

Surge (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)
Boulder Salvo deals 4 damage to target creature.

Pay 2 life: This creature gains flying until end of turn. (It can't be blocked except by creatures with flying or reach.)

When this creature enters, you may exile two cards from your graveyard. When you do, return target creature card from your graveyard to the battlefield.

Vigilance
Whenever you cast a creature spell, draw a card, then you may put a land card from your hand onto the battlefield.
, : Return target creature you control to its owner's hand.

When Alharu enters, put a +1/+1 counter on each of up to two other target creatures.
Whenever a nontoken creature you control with a +1/+1 counter on it dies, create a 1/1 white Spirit creature token with flying.
Partner (You can have two commanders if both have partner.)

Constellation — Whenever this creature or another enchantment you control enters, creatures your opponents control get -1/-1 until end of turn.

Dakmor Plague deals 3 damage to each creature and each player.

Whenever this creature or another Zombie enters, all non-Zombie creatures get -1/-1 until end of turn.

Flying
When this creature leaves the battlefield, return up to two target creature cards with power 2 or less from your graveyard to the battlefield.
Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)

Create a 1/1 green Snake creature token, a 2/2 green Wolf creature token, and a 3/3 green Elephant creature token.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
As this creature enters, choose a color.
, : Destroy target permanent of the chosen color.

When this creature enters, return target Knight card from your graveyard to your hand.

Whenever a creature you control deals combat damage, you gain that much life.