Monokuma, Despair Master

+3: Choose a creature at random, then choose another creature at random. The first creature deals damage equal to its power to the other. Investigate
-4: Target player sacrifices a creature, then investigates X times, where X is the sacrificed creature's converted mana cost or toughness (higher).
-10: Choose a creature, then sacrifice all other creatures. Put X +1/+1 counters on the chosen creature, where X is the number of creatures sacrificed