Izaic, the Big

Izaic, the Big enters with X food counters where X is the amount of mana used to cast him.
{t}{3}-Eat target creature. You gain food counters equal to that creatures converted mana cost.
{X}-remove X food counters from Izaic, the Big-create that many food tokens. Whenever you remove a food counter from Izaic, the Big you gain twice that much life.