Genocide, Slaughter Symbiote

Bestow {5}{b/g}{b/g} (If you cast this card for its
bestow cost, it's an Aura spell with enchant
creature. It becomes a creature again if it's not attached to a creature.)
Deathtouch, indestructible, menace, devour.
Enchanted creature gets +6/+6 and has
deathtouch, indestructible, and menace.
"Slaughter, man-kind."