Nihiloor

Most theft effects steal one creature and stop; this one converts your board's tap-down math into a rolling toll paid by the whole table. The enter trigger reads like a puzzle: for each opponent, tap up to one of your own creatures, then take a creature that opponent controls whose power is no greater than the tapped creature's. Big blockers you leave home become the currency for grabbing whatever each player has out, and the "for as long as you control Nihiloor" clause means the entire heist unwinds the moment this dies, the pressure valve that keeps the effect from becoming permanent removal. Cruelty arrives with the attack trigger: swinging with a creature an opponent owns (which is exactly the fodder Nihiloor hands you) drains that player for two and gains you two, so every stolen body becomes a life-swing pointed at its former owner. The color identity earns its keep: white supplies the taxing life-drain frame, blue the control-swapping, black the incremental attrition, and the card puts all three to work against a full pod at once rather than a lone target. Where multiplayer theft-and-drain commanders usually commit to one axis, this design welds control-magic to a per-attack politics engine, punishing the exact players whose creatures you borrowed. A 3/5 that would rather block than swing, running a war fought with everyone else's army.