Narset's Reversal

Most spell-copiers hand you a duplicate and let the original resolve; the wrinkle here is the bounce. Copying a spell and then returning it to its owner's hand means the original never resolves at all, which turns a copy effect into a counterspell that also fires the effect once on your own terms. Point it at an opposing removal spell and you kill their target with their own card, while they get the spell back to recast (and pay for) later. Point it at your own draw spell or ritual and you take the effect from the copy while keeping the original in hand for a second casting. The "choose new targets" clause promotes the card from mirror to redirection tool: an incoming burn spell or counter can be turned back on its sender. The cost of that flexibility lives in the target restriction. It only touches instants and sorceries, so a resolved permanent or an attacking creature sits beyond its reach, and it demands a spell already on the stack worth interacting with. That reactive constraint keeps it honest, but it also has the card doing something structurally rare for two mana: answering a spell, profiting from it, and leaving the opponent down a resolution on the exchange, all in one instant-speed window.