Balial, 100 Monsters

Mutate {b/g}{b/r}{u/b}
When Balial, 100 Monsters enters the battlefield
mutate all other creatures and mutations onto it.
Whenever this creature mutates, put +1/+1
counters on it equal to half the converted mana
cost of the mutator rounded up. Then deal
damage to any target equal to the number of
+1/+1 counters on this creature.