Rebel Informer

Black's answer to the white Rebel chain, and a pointed one: the activated ability tucks any nontoken Rebel onto the bottom of its owner's library, dismantling the tutor engine that defined its set. The Rebel mechanic let white players cascade up a creature curve by searching, then searching again, until the board was a toolbox of hatebears and utility bodies. This is the spoiler built specifically to break that loop, removing the keystone of a chain and forcing the white player to rebuild from scratch rather than recur. The protection clause reads like an afterthought until you remember who it was designed to fight: shielding the Informer from white spells and abilities from white sources means the opposing deck cannot use its own color's removal (the exile, destroy, and pacification effects white leans on) to pry the Informer loose, so the disruption sticks. It is a clean piece of color-pie discipline, the kind of asymmetric hate Wizards used to print directly into the same block as the thing it punished, with the cost and body kept low enough that it never threatened to do more than its one job. Strip the Rebel deck off the table and the second ability does nothing; the design knows this, and accepts it. This is a card built to make one archetype answerable rather than to earn a home of its own.