Riptide Entrancer

Most theft effects charge you in mana: pay the rate, take the creature. This one charges you in connection. Land a single point of combat damage, sacrifice the body, and gain control of target creature the defending player controls, with no cap on its size, cost, or toughness. The duration is what makes the trade so lopsided: not until end of turn, not until the body leaves, but indefinitely, the same permanence Control Magic grants, except there is no enchantment hanging around for an opponent to disenchant and no clean on-board answer once the sacrifice trigger resolves. The catch is the body. A frail 1/1 that has to connect with a player is begging to be blocked or burned before it ever swings, which is precisely the problem the morph cost is built to solve. Cast it hidden, swing into an opponent who has no reason to respect a nameless attacker, then flip it after blocks for and convert that face-down attacker's combat damage into their best creature. The whole play hinges on the guessing game: a defender who reads the morph correctly chumps or kills it, and one who reads it wrong hands over a permanent. The unmorph is not a backup plan to evasion; it is the mechanism. Disguise is how a fragile body that telegraphs its own threat ever lands a hit at all, and the hit is the entire toll.