Global Warming Elemental

+6: Destroy all creatures. Choose up to 3 lands you control then sacrifice the rest. Activate this ability only once per game.
0: Sacrifice a permanent. Put X loyalty counters on ~ where X is 1 + that permanent's mana value. Deal X damage to you and any target.
-8: You get an emblem with "Creatures you control have +1/+0 and haste. At the beginning of your end step, sacrifice each creature you control."