Gible

Protection from sources that cost {e}.
Last strike (This creature deals combat damage after creatures without last strike.)
Tribute 1 (As this creature enters the battlefield, an opponent of your choice may place one +1/+1 counter on it.)
When Gible enters the battlefield, if tribute wasn't paid, target player discards their hand.
{t}, Exert Gible: Gible deals damage equal to its power to target creature without flying.