Primordial Tendencies

Sacrifice all but one creature you control. That creature becomes a planeswalker with 5 loyalty points and the following abilities:
+2 - Inflict 3 damage to target player.
-2 - Gain control of a creature your opponent controls. Untap it, it has haste until the end of turn.
-12 - Exile all creatures from your graveyard and both players lose life equal to the combined power of those creatures.