Puft, Fartful Compainion

Compainion — Your deck must contain
Deerclops, The Firstborn, Nightcycle and
Lantern.
Flying
{t}: Puft, Fartfull Compainion creates a polluted oxeygen token.
Every turn on your upkeep Puft, Fartful
Compainion creates one slime counter.
{t}, Sacrifice 5 slime counters: All of the creatures
on the enemy team get a -1/-1 counter