Nahiri, Eldrazi Slayer

+2: Nahiri, ELrazi Slayer deals 1 damage to target creature. If that creature is colorless and has power 4 or less destroy it.
-4: Put a colorless Hedron artifact token onto the battlefield with "Colorless creatures get -1/-1."
-10: Each opponent sacrifices a creature they control then gets an emblem with "If you control no creatures you loose the game".