Shadow Rider

Black does not usually get flanking, and that is the whole point. The keyword debuted as a white-and-red signature for the desert horsemen of Mirage's cavalry tribe, a combat ability that punishes anything without flanking for declaring a block. Welding that aggressive trigger onto a 3/3 Knight in black is a quiet color-pie experiment: black already had some of the most efficient bodies for the cost, so the printing asks whether the keyword reads differently when the creature attached to it does not need the help. Note that flanking only fires when the card is blocked, which means it does its work on the attack, not on defense; a Shadow Rider sitting back never shrinks anything. The math is the same wherever it lives. Any blocker without flanking loses a point in each dimension before damage, so the body trades up against most ground creatures of comparable cost and walks through chump blocks from anything that started as a 1/1. The strategic axis flanking changes is not raw power but the attacking player's confidence: it turns combat into a question the defender has to answer with removal, a multi-block, or simply a blocker large enough to survive both the -1/-1 and the body. The result reads more like a tribal-set curiosity than a build-around, a Knight wearing borrowed armor from a tribe it was never meant to join.