Ring of Thune

Vigilance for two mana plus an equip of one is a fair rate on its own, but the upkeep trigger is what gives this Equipment its identity: it grows the creature it sits on, one counter at a time, but only while that creature is white. That color clause is the whole bargain. It pins the card to a single allied strategy rather than letting it float into any deck that wants a cheap source of vigilance, and it pays the growth out slowly, on your turn, after the equip has already cost you a sorcery-speed action. The result is an Equipment built for the long game in a white aggressive or go-wide board: attach early, keep attacking without surrendering a blocker thanks to vigilance, and let the counters accumulate while the creature stays back on defense between swings. As one of a cycle of Rings that each grant an evergreen keyword and a conditional upkeep bonus tied to a color, it sits at the patient end of the Equipment spectrum, closer to a slow-burn anthem than to the swing-now power boosts that define most combat-oriented gear. The vigilance is the floor; the white-only counter is the reason to run it over a generic alternative.