Whenever a creature you control mutates, put a +1/+1 counter on that creature and you gain 2 life.

Trample Discard a creature card: Put a +1/+1 counter on Lotleth Troll. {B}: Regenerate Lotleth Troll.

Mutate {G}{U} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) {1}, {T}: Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand.

Each creature spell you cast costs {1} less to cast if it has mutate. Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.