Polar Kraken

Trample This creature enters tapped. Cumulative upkeep—Sacrifice a land. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

"It was big. Really, really, big. No, bigger than that. It was *big!*" —Arna Kennerüd, Skyknight