Xanmire, Bloodthirsty Tyrant

First strike; lifelink (Damage dealt by this creature
also causes you to gain that much life.)
Whenever Xanmire, Bloodthirsty Tyrant deals
combat damage to a player, target land that
player controls becomes polluted. (It's controller
loses 1 life whenever it's tapped for mana.)
Pay 10 life: Put a +1/+1 counter on Xanmire,
Bloodthirsty Tyrant for each polluted land your
opponents control.