Ocean Man

Trample, swampwalk, islandwalk
Megamorph {5}{u}{b} (You may cast this card face
down as a 2/2 creature for {3}. Turn it face up
any time for its megamorph cost and put a +1/+1 counter on it.)
When Ocean Man is turned face up, put three
-1/-1 counters on each other creature.
Soaking up the thirst of the land.