Yuuki, Dauntless Prodigy

Flying, Haste
At the beginning of your upkeep, put a -1/-1
counter on Yuuki, Dauntless Prodigy.
When yuuki, Dauntless Prodigy attacks and isn't
blocked you may pay {4}{w}{b}{r}. If you do, deal
11 damage divided as you choose among any
number of creatures defending player controls.