Je'rek, the Unsustainable

Flying, trample
Dragon creatures you control have devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)
At the beginning of your upkeep, sacrifice the creature with the greatest power among creatures you control not named Je'rek, the Unsustainable
He teaches others to feed. And grow.