Zuko's Exile

Unconditional exile at instant speed, hitting three of the game's most durable permanent types, and the only concession attached is that you hand the victim a Clue token. That symmetry defines the exchange: the price of clean, color-agnostic removal that answers a resolved threat, an artifact engine, or an enchantment lock is that the opponent trades a permanent for a slow, taxed card-draw voucher. A Clue is not a rebuild of what you exiled; it is two mana and a sacrifice down the line for a single card, which almost never recoups the tempo they just lost. Structurally this is the effect that white and blue usually monopolize (exile that dodges regeneration, indestructible, and death triggers) offered to any deck that can pay five generic mana, with the softest possible compensation attached instead of nothing at all. The Lesson type is the other wrinkle. As a Lesson, the card can be fetched by learn effects, so it functions less like a maindeck removal slot and more like a toolbox answer summoned when a specific problem shows up on the board. That reframes the five generic mana it demands: rather than paying a card to hold it in hand, you reach for exactly the right tool at the moment it matters, and pay full retail for the privilege.