Opaline Bracers

Sunburst usually lives on artifacts that bank a number once and forget it: a creature that enters as a 4/4, a mana rock that taps for the colors you paid. Here the counter does double duty. The charges set at casting also feed the Equipment's continuous boost, so a four-color cast yields a +4/+4 strap that can hop from creature to creature for two mana apiece. That is the whole design tension: the payoff scales with how greedy your manabase is, but the cost is paid up front and frozen at four (the generic- cost caps sunburst at four counters, since only four mana can be spent). Pay one color, get a +1/+1 Equipment that will never grow; stretch for all four and the bracers reward the reach permanently. Unlike most pump Equipment, there is no way to add counters after the fact, so the casting decision is the entire negotiation. The card belongs to an early period of five-color-matters design, where wedging a rainbow of mana into a single cast was treated as a deckbuilding achievement worth rewarding, and an Equipment was the natural home for it: a one-time investment that keeps paying out across the bodies you attach it to. Long after the casting flourish is forgotten, the bracers settle into a colorless mobile buff with a cheap, fixed equip cost.