High Fae Negotiator

Bargain is an additional cost worn as a coin flip: pay one spare artifact, enchantment, or token as you cast, and the enters-the-battlefield trigger fires, draining each opponent three and refilling you the same. The deal is gated behind a board where you already have fodder to burn, so a deck built to spit out tokens or cheap enchantments treats the cost as a rounding error and gets an asymmetrical six-point life swing (three drained from each opponent, three back for you) stapled to an evasive body. A deck without the supporting cast just gets the 3/5 flier, and the drain never happens. That is exactly what Bargain was built to do: let sacrifice-value shells convert overflow into effect, in a color that has always drained opponents point by point. The 3/5 body is doing quiet structural work too. Five toughness is the number that shrugs off the small-ball removal and combat a go-wide deck tends to run into, so the creature keeps flying in long after the drain has resolved: the life-swing is the burst, the flier is the follow-through. The whole package points at aristocrats and token-heavy black, where you are not sacrificing to assemble a combo but to turn permanents you were already generating into a life-total heist and a resilient threat in a single cast.