Subterranean Scout

A one-shot evasion grant priced as a body, and the power restriction does all the balancing work. The trigger only unblocks a creature with power two or less, walling it off from any finisher role: it pushes through the one-drops and the tokens, never the haymaker you actually want connecting. That ceiling pins the card to a narrow job, sliding a small attacker past a stalled board for exactly one turn. The timing matters because the trigger fires once on entry rather than at instant speed, so it wants to come down before combat with a worthwhile small threat already in play; arrive after blocks are declared and the line is wasted. That makes it a tempo play, not a combat trick, since the creature being unblocked has to exist and be worth swinging with before the Scout ever resolves. The two-power body adds a point of pressure and then dies to almost anything, which fits the design: this is reach attached to a creature, not a creature that happens to grant reach. It rewards a board that is already wide and low to the ground, where one unblocked attacker turns a stalled clock into a lethal one. Outside of that go-wide context the conditional effect has little to grab onto, and the rate alone does not carry it.