Ratcatcher

Tribal tutors usually arrive cheap and conditional; this one is neither, and the asymmetry is the design statement. The upkeep trigger fetches a Rat to hand every turn, no payment, no discard, no random draw: a free card each loop for as long as the engine survives. Black tended to charge life or rarity for that kind of repeatable advantage in its early years, so the cost here is loaded entirely onto the front end. Six mana and a 4/4 body is a steep price of admission for a recursive tutor, and Fear is what tries to justify it: the keyword keeps the body hard to chump and means the engine keeps grinding while the 4/4 still pressures life totals. The catch is the slow start, paying six to begin a clock that only pays off on subsequent upkeeps, and the trigger's value depends entirely on the Rat library behind it. As a payoff it points at a deck that wants a thick spread of Rats (Marrow-Gnawer, Pack Rat, Swarm of Rats) and a reason to draw one every turn rather than a single bomb to find once. The tutor is for a swarm, not a toolbox: it is built to keep refueling a wide board, the kind of grindy tribal engine that rewards a long game and punishes nothing but the clock.