Kar Adim, Unstoppable Crusher

Trample, menace
Whenever Kar Adim, Unstoppable Crusher deals combat damage to a player, that player sacrifices a land.
At the beginning of your upkeep, if you don't control another creature with power 5 or greater, sacrifice a land.
"Roaaaurrrrr!"
—Kar Adim's favorite word, meaning "time to destroy everything"