Corrupt Scorpion God

+5: Draw a card. All opponents lose life equal to it's converted mana cost. You gain life equal to life lost this way.
-5: Corrupt Scorpion becomes a 40/40 creature with trample and first strike until end of next turn. Corrupt Scorpian is still a planeswalker.
-10: Exile all opponents cards on the battle field and in their hand. Opponents lose life equal to the number of cards exiled this way.