Fiendlash

Most damage-redirection effects share a hidden requirement: they need a body willing to take a hit and hand it back, and this gear wires that incentive straight into the equipment. Reach coaxes the wearer into blocking flyers it has no business blocking; +2/+0 makes the return fire outweigh the incoming damage; and the retaliation triggers on any damage dealt, not just combat, so a burn spell aimed at your creature becomes your creature's power flung at a player or planeswalker of your choosing. Boros Reckoner is the obvious ancestor, but the aim is different in a way that matters: Reckoner sprayed its damage back at whatever hurt it, while this untethers target from attacker and lets you point the retaliation wherever it does the most damage. That freedom of aim is the whole reason it plays as a finisher instead of a fight-picker. Even when the wearer never takes a scratch, the +2/+0 keeps shoving extra combat damage through, so the equipment idles rather than dies; it just runs at half throttle until something connects. The full engine wakes up the moment you court damage: pinging your own team, feeding the creature into blocks, leaning on effects that rake the board. Since the redirect scales with power, the natural home is a large attacker you already want swinging, turning every trade and every stray point of noncombat damage into a redirected burn spell.