The Great Maw

While The Great Maw is on the battlefield, it's a
land. (It's not a creature.)
{t}: Add {b}, {g}, or {u} to your mana pool. When
you cast a creature spell with this mana, it gains
Devour Food 2.
Whenever you sacrifice one or more permanents
to a Devour ability you control, Untap The
Great Maw and each opponent loses that
much life.