Ruu, Penultimate Hunger

Trample, haste
Devour 3 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with three times that many +1/+1 counters on it.)
When Ruu, Penultimate Hunger enters the battlefield, it deals X damage to all creatures, where X is 2 plus the number of creatures Ruu, Penultimate Hunger devoured.