Opaline Bracers

Opaline Bracers

Artifact - Equipment (CMC 4)
Sunburst (This enters the battlefield with a charge counter on it for each color of mana spent to cast it.)
Equipped creature gets +X/+X, where X is the number of charge counters on Opaline Bracers.
Equip (: Attach to target creature you control. Equip only as a sorcery.)