Willbreaker

Most theft effects wear their price on the sleeve: a hard-cast Aura like Control Magic pays four mana for one creature, and a Threaten effect rents a single body for the turn before handing it back at cleanup. This 2/3 Wizard rewrites those economics by hooking the trigger not to what you spend but to whom you point at. The instant a spell or ability you control targets an opposing creature, that creature defects. The consequence is that your cheapest, most disposable interaction stops being removal and becomes acquisition: a one-mana pinger, a tap-down, a fight spell, even a ping meant to clear one blocker turns into a seizure, and a repeatable pinger converts the whole opposing board over creature by creature with no additional mana. The control clause is where the design keeps itself honest. It grants each stolen creature only for as long as you control this Wizard, so the entire borrowed army snaps back to its owners the moment you lose it: not just to a removal spell, but to a bounce, an exile, or a theft effect of the opponent's own. That is the tension the whole card is built around: it converts every targeted effect in your deck into a theft enabler, then stakes all of it on one fragile body that draws answers it cannot afford to lose. This is a build-around in the truest sense, inert on arrival and devastating a turn later, asking you to run cheap targeted spells you would never otherwise want for their printed effect.