Karn, Compleated King

Flying
Whenever you cast a spell, put a +1/+1 counter
on Karn, Compleated King for each of that
spell's colors.
Remove five +1/+1 counters from Karn:
Add {w}{w}{u}{u}{b}{b}{r}{r}{g}{g}. Activate only
once each turn.
"The last stain of Urza's legacy"