The Dominion Bracelet

Mind control has always been priced as a top-of-curve haymaker: five mana for Control Magic, a permanent theft on a creature you keep. The Dominion Bracelet reframes the effect as a threat you have to build up to. Turn-controlling a whole opponent (their draw, their attacks, their discards, every decision they'd make) is one of the strongest effects in the game, so the design puts it behind a wall and then hands you a ladder. The equipped creature's power is the discount: the fifteen-mana ceiling drops by one for each point, so the ability is a distant fantasy on a 1/1 and a live, castable line the moment your Equipment sits on something genuinely large. That turns a static buff into a countdown clock. The +1/+1 is not the point; it is the first rung, nudging the carrier one step closer to the sorcery-speed detonation. And the Bracelet exiles itself on activation, so this is a single, committed swing rather than a repeatable engine: you spend the turn, you take theirs, and the artifact is gone. The lineage here is not Control Magic's clean permanence but the one-shot turn-theft of Emrakul, the Promised End, rebuilt as an Equipment whose cost you assemble yourself by growing a creature big enough to pay it down.