Bombadil's Song

Green has been selling untargetability by the point for years: a small pump stapled to hexproof, cast at instant speed to blank targeted removal or steal a combat step. What distinguishes this one is the rider it drops on the way out. Casting it tempts you with the Ring, promoting one of your creatures to Ring-bearer (or advancing the one you already have) and layering on another of the emblem's escalating perks: skulk to slip through blockers, a loot when it attacks, forcing a blocker to be sacrificed, or a drain of life from each opponent. The protection is the transaction; the Ring is the change you keep. Every other green protection instant is spent and forgotten, its two mana buying a single clean rescue with nothing left behind. This one converts that same rescue into forward motion on a set-wide subsystem, so the creature you saved walks away a little more dangerous than it was before combat. The effect is strictly additive: the Ring hands the bearer beneficial abilities as its counter climbs, so there is no downside ledger to weigh against the save. The interesting decision is which creature you want carrying that growing package of abilities, since the temptation always attaches to a body of your choosing and the perks compound over the course of a game.