Helter-Skelter

Enchanted creature gets +2/+1 and Trample.
When enchanted creature attacks and isn't
blocked, flip a coin. If you win the flip, untap it
and remove it from combat. It deals X times two damage divided evenly among X targets. If the
number of targets available is less than X, you
may then target the same target multiple times.
(X is equal to enchanted creature's power.) If you
lose the flip, return Helter-Skelter to its owner's
hand.