When this creature enters, create a 1/1 green Squirrel creature token and a 0/3 blue Crab creature token.
When this creature dies, create a token that's a copy of target token you control.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
When this creature enters, create two 1/1 colorless Thopter artifact creature tokens with flying.

Flying
Whenever a land an opponent controls enters, you may gain 3 life.

This creature can't be blocked except by Walls and/or creatures with flying.

Flying
Wither (This deals damage to creatures in the form of -1/-1 counters.)
Creatures your opponents control with counters on them can't attack or block.

Each player mills two cards. Then you put a creature card from a graveyard onto the battlefield under your control.

Flash (You may cast this spell any time you could cast an instant.)
Whenever this creature is dealt damage, draw that many cards.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When this creature enters, return target instant or sorcery card from your graveyard to your hand.

Flying, first strike

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

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

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

Whenever a creature attacks, you gain 1 life.

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

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.

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.)

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.

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

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

As long as this creature is enchanted, it gets +2/+2 and has flying, first strike, and trample.

Whenever another creature you control with power 3 or greater enters, you may draw a card.

Flying
When this creature enters, return target permanent to its owner's hand.
Suspend 3— (Rather than cast this card from your hand, you may pay and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

When this creature enters, destroy target artifact or enchantment.

Flying
When this creature enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Put target artifact, creature, or enchantment on the bottom of its owner's library.
Miracle (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Flying
When this creature enters, you gain 1 life for each creature you control.

Create three 2/2 black Zombie creature tokens.
Cycling (, Discard this card: Draw a card.)
When you cycle this card, create a 2/2 black Zombie creature token.

Will of the council — When this creature enters, starting with you, each player votes for blue, black, red, or green. This creature gains protection from each color with the most votes or tied for most votes.

Landfall — Whenever a land you control enters, this creature gets +4/+4 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)

Choose one —
• Destroy target creature.
• Return target creature card from your graveyard to the battlefield.
Entwine—Sacrifice three lands. (Choose both if you pay the entwine cost.)

Sliver creatures you control have "When this creature enters, you may exile target creature an opponent controls until this creature leaves the battlefield."

, Tap X untapped artifacts you control: Look at the top X cards of your library. Put one of those cards into your hand and the rest into your graveyard.
Partner (You can have two commanders if both have partner.)

Target player gains 7 life and draws two cards.

( can be paid with any two mana or with . This card's mana value is 6.)
Flame Javelin deals 4 damage to any target.