Domestication

Theft with an expiration clause baked into the rate. Permanent steal auras like Mind Control and Confiscate let you keep whatever you take, however large it grows, but they cost more and they care nothing about size. This one comes in cheaper and writes a leash in exchange, and the leash is the whole point. The power-4 check runs at your end step, which tells you exactly what the card was built to grab: small, efficient bodies whose worth lives in something other than their size. A mana dork, an evasive one-drop, a token-spinning value engine. The moment your prize swells past three power, whether by counter, equipment, or a pump spell on the controller's turn, it walks home on your next end step. That makes the Aura a soft answer rather than a hard one: it pins a creature that fights at small stats, and it falters against anything the original controller can inflate in response. The window belongs to you alone, since the sacrifice only checks on your end step. A creature buffed during your opponent's turn stays yours through your entire following turn before the bill comes due, so you can swing with it, tap it, sacrifice it for value, even sacrifice and reanimate it, all before the size check ever resolves. Steal priced below permanent theft, then quietly capped so the discount never lets you keep the things worth keeping.