Lunatic Pandora
A one-mana artifact stitched together from two abilities priced worlds apart. Most of its working life is spent as a repeatable filtering engine: two mana and a tap to surveil, quietly stocking a graveyard and smoothing draws for reanimation and delirium shells without asking for a specific color. Only when six mana comes free does it shed the engine role and become a sacrifice: tap, give it up, destroy any nonland permanent. That steep back-end cost is doing all the balancing. A colorless one-drop that could both dig through a deck and remove a threat on a fair curve would slot into everything; instead the removal sits far enough out of reach that the card has usually finished paying rent by filtering long before the destroy clause matters. The design lives in the distance between the two abilities rather than the quality of either: cheap and passive up front, an expensive panic lever much later. The genuine deckbuilding question is which half you are actually paying for. Nearly everyone wants the surveil and treats the destroy mode as a last resort, a way to convert a spent utility artifact into an answer once your graveyard is already full and the top of the deck no longer needs sculpting.
