Memory Leak

Flash This creature enters with three +1/+1 counters on it.

Vigilance When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Whenever this creature mutates, put a +1/+1 counter on it.

Exile target creature with power 4 or greater.

1W, T: Tap target creature.

Creatures you control get +2/+1 until end of turn. Cycling 2 (2, Discard this card: Draw a card.)

Mutate 2WW (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.) Lifelink Whenever this creature mutates, create two 1/1 white Cat creature tokens with lifelink.

When this creature enters, create a 1/1 white Human Soldier creature token.