Lab Rats

The textbook demonstration of buyback's central tension: a token-maker priced so that the recurring cost outweighs the output, until you stop thinking of it as a card and start thinking of it as a mana sink. For one black, it makes a single 1/1. Pay the additional four and it returns to hand, so each subsequent activation costs five mana for one Rat that can be redeployed forever. What balances the rate is the buyback price itself: at four extra, no individual rat is worth the investment, which means the card only justifies its existence in a deck with so much mana that one-per-turn (or several-per-turn) rats become a real clock late in a long game. That is the whole pitch: an outlet for excess black mana that never runs out and never goes to the graveyard. The card encodes a specific lesson about how the buyback keyword was tuned in its era. A reusable token engine has to be charged so steeply that it functions as a luxury, a way to convert a flooded board state into bodies rather than a curve play. Lab Rats is buyback at its most honest: a spell whose ceiling is "infinite rats given infinite mana" and whose floor is "a 1/1 for one," with the entire game existing in the distance between those two outcomes.