Phyrexian Infiltrator

The oddity is the wiring: a Phyrexian Minion printed in mono-black whose only ability demands , a sum that drops the activation squarely into Dimir territory regardless of where the body fits. The effect is a permanent control swap, the indefinite kind that predates the trade-back fixes layered onto later steal effects: you hand over a 2/2 and take whatever you want in return. That asymmetry is the design logic. The body is cheap and expendable, worth almost nothing on its own, which makes the exchange a lopsided steal when the target is a finisher and a non-event when both creatures are of similar value. The repeatability is both catch and appeal: nothing about the ability says "once," so the body can shuttle between players' boards as long as someone keeps paying the toll. Crucially, the 2/2 your opponent receives keeps the exchange ability, which means they can pay to swap it right back; the card you stole and the creature you surrendered are both live targets for whoever next pays . As a piece of multicolor-block design it reads as a deliberate puzzle: a creature whose printed color and its functional color pull in opposite directions, built for a deck that already wants both black bodies and blue mana rather than one chasing a one-shot theft.