Bellagrohk, the Lotus Eater

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.)
Whenever you sacrifice another permanent, this
creature explores. If a nonland card is revealed
this way, create a 1/1 blue Frog creature token. (Reveal the top card of your library. Put that card
into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put
it into your graveya