Mr. Clean, the Cleanly

Flying, Double Strike, Trample, Likelink
As long as your devotion to colorless is less than
ten, Mr. Clean is a 1/1 Human with no other
abilities except for this one.
Clean Sweap -- At the beginning of your end step,
you may pay any amount of colorless mana. If
you do, exile that many colored permanents.
"Is that my dad?..." -- Random Teen