Reversal of Fortune

The fantasy is theft, but theft on the opponent's terms: you only get to steal what they brought, and only if they brought the right kind of card. Reveal their hand, and if there is an instant or sorcery worth copying, you cast the copy free, then and there, as the spell resolves. No saving it for later: the copy comes with no specified duration, so it goes on the stack now or not at all. The catch is structural rather than incidental. Six mana of double-red commitment is a heavy down payment on a card that does literally nothing against a creature deck, a planeswalker deck, or any opponent who has already emptied their hand. And while it resolves like any other sorcery, it never touches what is already on the stack: it never counters a spell, never redirects one, just rummages through what they are holding and helps itself to a copy. That makes the payoff swing wildly with the matchup, dead against aggro, backbreaking across a slow mirror where the prizes are sweepers, card draw, and the win conditions they were saving. The conditionality is both the problem and the appeal. Red rarely gets clean access to another color's best spell, and here a red pilot can cast a fully functional foreign sorcery without splashing for it. The price is knowing, going in, that the opponent is holding something worth the heist.