Voracious Vermin

The two abilities are wired to feed each other, and that closed loop justifies the modest 2/1 body: this is aristocrats design compressed into a single card, the sac-fodder generator and the payoff living in the same slot rather than needing two pieces to connect. Entering with a Rat token that can't block hands you exactly the kind of expendable creature its second ability wants: a body you were never planning to keep, ready to be sacrificed, thrown under a bigger blocker in an attack, or traded off to grow the Vermin. Each death that follows stacks another +1/+1 counter, so a 2/1 that already arrived with a friend becomes a real threat the moment the board starts feeding it. The token's "can't block" clause is the constraint doing double duty: it denies you a free defensive body and pushes the token toward attacking or the sacrifice altar, which is precisely where the growth engine wants it. What makes the design tidy is that it seeds its own engine, providing the first death-fodder rather than asking the rest of your deck to supply everything. The counter accrual only matters when bodies are dying, so the card asks to be run alongside creatures you were already treating as resources; drop it into a board with nothing to spare and it does the least.