Icy Prison

Removal built as a maintenance contract rather than an answer. The exile is real and immediate, but the upkeep clause inverts the usual ownership of a lock: the enchantment falls unless someone pays three mana each of the controller's upkeeps, which means the creature is not held for free. Someone has to keep paying for it. That "any player" wording is the design pivot. Anyone at the table with a reason to keep the creature exiled can foot the bill, and conversely, if nobody chooses to pay (including the controller), the prison sacrifices itself and the leaves-the-battlefield trigger hands the creature back to its owner intact. So the question is never "did I kill it" but "is keeping this off the board worth three mana a turn, and to whom is it worth that." There is no permanent profit here, only tempo rented at a recurring cost, and the renter is whoever values the exile most. This is removal as an ongoing tax, the same structural instinct that produced the upkeep-leashed designs of its era, where powerful effects were balanced not by a printed restriction but by a per-turn payment that the controller had to keep honoring. The constraint is what keeps a two-mana exile fair: it answers the creature now and asks you to keep funding the answer later, because the turn the payment lapses, the threat walks back onto the battlefield.