Avocado Pit-Bull

When Avocado Pit-Bull enters the battlefield, sacrifice a creature. If that creature was a food creature, gain 2 life.
{b/g}: Exile Avocado Pit-Bull under a creature. When that creature leaves the battlefield, return Avocado Pit-Bull to the battlefield. If Avocado Pit-Bull was exiled under a food creature, gain 2 life.