Polukranos, World Eater

{x}{x}{g}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it
becomes monstrous.)
When Polukranos, World Eater becomes
monstrous, it deals X damage divided as you
choose among any number of target creatures
your opponents control. Each of those creatures
deals damage equal to its power to Polukranos.