Void Infestor

Mutate{p/b}{p/b}: Void Infestor mutates as normal,
except it can only be placed on the bottom and
can not mutate with Legendary creatures.
You may have up to 6 cards named Void Infestor in your library.
Whenever this creature would take damage for
the first time each turn, prevent that damage.
Whenever this creature mutates, you may return target creature from an opponents graveyard to
the battlefield under your control, if you do, it
mutates onto that creature instead.