Slith Predator

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

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

Equipped creature has trample and "Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."

Equip

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

Whenever this creature deals combat damage to a player, create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")

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

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.)