Ring of Evos Isle

The repeatable hexproof button is the load-bearing half: for two mana at any time, the equipped creature shrugs off targeted removal, bounce, and aura-based answers, and because the protection costs mana rather than a single charge, you can spend it on whatever threat needs shielding turn after turn. The cheap equip cost lets it hop between bodies as the board shifts, so it never gets stranded on a creature that has already done its work. What it does not do matters just as much: hexproof is a targeting answer, useless against a board wipe that hits everything and useless against edicts, which point at the controller and ask them to choose a sacrifice rather than naming a creature. That ceiling is the recurring tension with protective equipment of this stripe. The mana-spent shield buys safety against pinpoint removal precisely while leaving the creature exposed to the mass answer, and a sweeper that takes the body simply leaves the equipment sitting on the battlefield with nothing to protect until you re-equip. The upkeep counter is the second clause, a soft incentive conditioned on the equipped creature being blue, which keeps the card from being a colorless plug-in and roots it instead as a payoff for a blue-creature shell. Pay full freight and anything gets an instant-speed shield; commit to blue and you also get slow, passive growth stacking on top of the protection.