Magus of the Bridge

An engine that lives and dies by which graveyard fills first. As long as your own creatures are the ones dying, this pumps out a 2/2 Zombie for each nontoken body that reaches your yard, turning any sacrifice loop or attrition war into an army-building machine. The second clause is the wager: the moment a creature lands in an opponent's graveyard from the battlefield, the Magus exiles itself. That asymmetry is the entire design. What would be a broken symmetrical token factory becomes a self-policing one, tuned for shells that refuse to trade or block, or that route enemy creatures off the battlefield some other way (bounce, tuck, exile) so nothing dies on the opposing side. The triple-black cost signals the shell it wants: a heavy black deck where free sacrifice fodder and recursion are already the plan, and where the downside can be sequenced around rather than stumbled into. Left unchecked in a grind of aristocrats and repeated sacrifice, it snowballs faster than most three-drops have any right to; force a single opposing creature into its own graveyard on your watch and the whole thing evaporates. Following the Magus tradition of reprinting an old effect on a Human Wizard, the name and body echo a well-known enchantment, but the 4/4 for three keeps the body above-rate even before the tokens start rolling. The constraint is the interesting part: this token engine only runs when the dying stays one-directional.