Crystal Skull, Isu Spyglass

Top-of-library engines usually gate their card advantage behind a type restriction that keeps the payoff coherent: this one draws the fence around "historic," a wider net than it first reads. Artifacts, legendaries, and Sagas together cover a huge swath of the multiverse's card pool, and permission to cast all of them off the top (plus play historic lands from there) turns the library into a second hand that refills every draw step. The look-anytime clause is what keeps the engine reliable rather than a gamble; you always know whether the top card is castable before you commit mana, so the ability rewards a deck built dense with legendary permanents and artifact chaff over one that hopes to flip into value. The mana-tap line is the quiet counterweight: it means the card isn't a dead rock while your top-of-library flow stalls, and it lets the four-mana investment start paying for the very spells it's revealing. The design shares its bones with top-deck manipulation pieces like Future Sight and Vizier of the Menagerie, but where those anchored to a color's whole spell base or to creatures, this one leans into the "historic" supertype cluster, which skews the whole engine toward artifact-and-legendary builds that treat their libraries as extensions of the board.