Planetarium of Wan Shi Tong

Free spells have always been priced by the friction of assembling the trigger, and this artifact all but eliminates it. The engine is two halves that feed each other: a repeatable one-mana scry welded to the artifact, and a payoff that fires whenever you scry or surveil, letting you cast the newly-revealed top card without paying for it. Because the activated ability supplies its own trigger, this is a self-contained loop rather than something begging for external scry effects. What keeps it from spiraling is cadence. The free cast is capped at once each turn, and you only ever look at the single card on top, so no amount of incidental scrying or surveiling elsewhere in your list buys a second free spell that turn. That once-per-turn ceiling does the containment work: extra scry effects still smooth your draws, but they cannot compound the cheat. And because you are dodging a full mana cost, the reward scales with expense. The ideal top card is the one you would not otherwise cast this turn: the seven-drop bomb, the double-digit finisher, the spell whose whole appeal is that its price never came due. The design belongs to the lineage of "cast the top card" permanents, but where most of those ask you to gamble on what you flip, this one hands you the scry first, converting a coin-flip into a decision. You choose whether the card on top is worth taking before you commit to it.