Angel of Death

+4: Create ten 1/1 reaper tokens with flying and haste, with the effect "If a player is dealt combat damage they lose the game.
+6: Until end of turn Angel of Death becomes a 10/10 creature token with haste, flying and indestructible. It is still a planeswalker.
-15: Opponents cannot cast spells unless they pay four colorless more for each spell cast.