Mastiffa Oklein

Whenever Mastiffa Oklein enters the battlefield,
create two 2/2 black Zombie creature tokens.
Whenever a non-zombie non-demon creature
would die, exile it instead, that creature controller
creates a 1/1 white Spirit creature token with
flying, target Zombie you control may become a
copy of that exiled creature.
{3}{b}{b},{t}: Create two 2/2 black Zombie creature
tokens.