The Swarmed Scarab

Mutate {2}{u}{b}{p/b}{p/u}
Indestructible
At the end of every turn, if your life total is lower
than it was at the begining of the turn, create an
X/X black Phyrexian zombie creature token with
trample, where X is the amount of life you lost
during the turn.
Whenever this creature mutates, you may pay 3
life. If you do, return a Phyrexian creature from
your graveyard to the battlefield tapped.