Ruby, Suicidal Shepherd

+2: Search your library for a Scrim planeswalker if there is not already one in your hand. Create a 1/1 black and white sheep creature token.
-5: Each opponents gets 3 poison counters. If you activate this ability more than once you lose the game.
-15: All nonlegendary creatures are sacrificed by there controller. All players exile there graveyards.