Ogopogo, Tide's Hunger

Trample
Tribute X, where X is the number of creatures
the chosen player controls. (As this creature enters
the battlefield, an opponent of your choice may put X
+1/+1 counters on it.)
Whenever an opponent attacks you with three or
more creatures, if tribute wasn't paid, that player chooses two of them and sacrifices one. Put the
other on top of its owner's library.