Cateran Kidnappers
The recruiter that makes the chain go, and the chain is the whole point. This tribe was built around a tutoring ladder: each Mercenary fetches a cheaper one into play, so the expensive bodies drag the bottom of the curve up behind them. Pay three, tap, and you don't draw the next piece, you put it down already on the battlefield. The tap in the cost is the first brake on the engine: a fresh kidnapper has summoning sickness like any creature, so it cannot search the turn it arrives, and each link in the chain costs you a turn of waiting before it can extend the line. The activation cost is the second brake. Three generic mana per tutor is steep enough that the Mercenary deck was always a slow grind rather than a combo, which is exactly the friction the design wanted; an uncosted version of this effect would have collapsed the format's library into a single repeatable line. The four power is the consolation for that price: with two toughness the body is not built to survive, so the design hands it a real clock to justify spending a turn doing nothing but searching. What the card represents is a particular late-era design instinct: tribes defined not by lords and overlapping keywords but by a recursive search engine, the same skeleton that Rebels got on the white side of the same block. The Mercenaries fetched downward and were the worse half of that pairing, but the kidnapper is the card that made the deck function.
