Prowling Abomination

Mutate {p/w}{p/w}{p/w} (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.)
Double Strike, Exalted
When this Creature Mutates, you may gain 2 life X times, where X is the number of plains you control.
Tap any creature you control: It gains Exalted until end of turn.