Quicksand

In Commander, Quicksand is a fringe inclusion that punishes aggressive creature decks by removing a small attacker without spending a card from hand — the cost is a land, so it only makes sense in landfall or land-recursion shells. In Legacy and Vintage, the power level is too low to compete; cheap removal does the job more efficiently and without sacrificing mana production. Pauper is where Quicksand has the most historical relevance, seeing occasional play in control lists that can afford to trade a land for a creature in the early game. Across all formats, the narrow targeting — non-flying attackers only — limits its upside sharply.