Ozz

Put X +1/+1 counters on Ozz.
{t} FIGHT ME! Ozz Fights target creature. If you kill target creature you get X +1/+1 counters and Z +1/+1 counters, where Z is the sum of that creature's power and toughness.
{s}{s}{s}{s}{s} or {w}{u}{b}{r}{g} This creature turns into his plainswalker form