Helm of the Ghastlord

An Aura that pays you differently depending on what color the carrier is, and most steeply when the carrier is both. Strapped to a blue creature, it adds +1/+1 and turns every hit into a card; strapped to a black one, it adds +1/+1 and turns every hit into discard. A body that registers as both colors runs both clauses at once, refilling your hand while emptying theirs on the same connection. The reward scales with how committed the carrier is to those two colors: a colorless or off-color creature gets nothing, while a dual-color beater extracts the full engine. What sharpens the design is the trigger condition. It keys off damage dealt to an opponent, not combat damage, so a creature with a pinger ability can drive it without ever entering the red zone, and it fires once per damage event rather than scaling with the number stamped on the creature. The card does not want a giant attacker so much as one that connects turn after turn: evasion and repeatability matter more than raw size. The standing Aura risk applies in full (kill the creature and the enchantment goes with it, a clean two-for-one for the opponent), but the carrier that survives a few turns converts that vulnerability into a runaway: hand-fill and hand-strip stacking every combat step until someone interacts.