Mr.Clean

{t}:Put a Dirty counter on tatget creature.
{4}{ut}:destroy all creatures with Dirty counters on them. Cast this only times when you could cast a sorcery.
Menace, Indestructible
Clean 6 (Look at the top 6 cards of everybodys' libraries, dividing those 6 cards among you, and exile those cards)
Mr.Clean keeps it clean.