Colossal Skymaw

Flying, trample
Whenever a creature you don't control dies,
untap Colossal Skymaw and you gain 1 life.
{r}{g}, Sacrifice another creature: Colossal
Skymaw gets +2/+2 and gains menace until end
of turn. If that creature had mana value 4 or
greater, you may have Colossal Skymaw fight
target creature you don't control.