Emrakul and 15 Squirrels

Flying
Whenever Emrakul and 15 Squirrels enters the
battlefield, if it wasn't cast, target opponent
creates 15 1/1 green Squirrel creature tokens
with reach.
Whenever Emrakul and 15 Squirrels enters the
battlefield, if it was cast, create 15 1/1 black and
green Squirrel creature tokens with reach and
decay.