Nyssa of Traken
Sonic Booster asks a question most artifact-payoff cards never bother with: what if the sacrifice count and the reward count were the same number, decided in one attack step? Feed it three Treasures, an expired Food, a spent Signet, and it taps five blockers while refilling your hand with five cards, all off a single trigger. The mechanic scales linearly with your artifact glut rather than capping out, which is why lifting the hand-size ceiling is not decoration: this is a card that expects to draw well past seven in a turn and wants you to keep the surplus. The tapping half is the underappreciated part. It is not removal, but it is a repeatable Falter aimed exactly where the attack needs the lane cleared, and because it fires on the declare-attackers step, you resolve it before blockers commit. What holds the engine honest is that the artifacts have to already be gone: you are converting real board resources into a one-time burst, so the ceiling is only as high as the tokens and trinkets you can afford to feed it. Doctor's companion makes the whole thing a two-card command-zone proposition, pairing the sacrifice-and-draw shell with whichever Doctor sets the deck's clock. On her own she is a 3/4 that wants a graveyard's worth of cheap artifacts behind her; alongside a Doctor, she becomes the payoff that turns an artifact economy into cards and open swings.
