Infecton Form

{t}, Sacrifice this creature: return
target non mutant creature with mana cost less
than 4 from an enemies graveyard to the
battlefield under your control or creturn
target mutant creature with mana cost less
than 4 from your graveyard to the battlefield
under your control.
"We exist together now, two corpses in one grave"
-Gravemind, Corpse Collector