Anya, Merciless Angel

A 4/4 flyer for five that does nothing until somebody is already bleeding, and that conditionality is the entire design. The body sits inert at parity, then swells into a 7/7 indestructible threat the instant one opponent drops below half their starting life, growing again for each additional opponent past the same line. In a duel that makes her a closer rather than an aggressor: she rewards the deck that has already done the damage, arriving to finish a race it is winning rather than to start one. In multiplayer the math steepens, because the static ability counts every opponent whose life total is below the halfway mark, and a four-player table offers three separate life totals to push under it, each one stacking another +3/+3. The indestructibility rides the same threshold, so the moment she becomes a 7/7 she also stops dying to combat and most targeted removal at once. Both effects are continuous, not one-shot: they wink on and off as life totals cross the line in either direction, which means a single life-gain swing on the defending side can strip the buff and the protection together in a beat. That fragility is the honest cost of the upside. She is built for the board state where an opponent is already on the back foot, and she contributes nothing to creating that state, only to cashing it in.