Trample

Whenever this creature deals combat damage to a player, create a token that's a copy of this creature.

Trample

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Trample

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.

Flying, trample

Whenever this creature deals combat damage to a player, you get that many (energy counters).

Trample

Whenever a Saproling you control deals combat damage to a player, create that many 1/1 green Saproling creature tokens.

Whenever this creature deals combat damage to a player, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Trample

Whenever Cadira deals combat damage to a player, for each token you control, create a 1/1 white Rabbit creature token.

Whenever this creature deals combat damage to a player, untap target creature or land.

Whenever this creature deals damage to a creature, destroy that creature at end of combat.

Ravenous (This creature enters with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Trample

Spawn Termagants — Whenever this creature deals combat damage to a player, create that many 1/1 green Tyranid creature tokens.

Whenever this creature deals combat damage to a player, you get (two energy counters).

Pay : Put a +1/+1 counter on this creature.

Trample

Whenever Tana deals combat damage to a player, create that many 1/1 green Saproling creature tokens.

Partner (You can have two commanders if both have partner.)

Whenever this creature deals combat damage to a creature, destroy that creature at end of combat.

Whenever this creature deals combat damage to a player, you may draw a card.

Myriad, myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token that's a copy of this creature that's tapped and attacking that player or a planeswalker they control. Then do it again. Exile the tokens at end of combat.)

Whenever this creature deals combat damage to a player, put a +1/+1 counter on target creature you control.

Whenever this creature deals combat damage to a player, create a 1/1 colorless Sand creature token for each land you control.

Equipped creature gets +2/+0 and has trample.

Whenever equipped creature deals combat damage to a player, create that many 1/1 green and white Citizen creature tokens.

Equip

Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

When this creature enters, create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")