Epic Experiment

The whole engine hinges on a single conversion you control: every mana you sink into X both sets the size of the dig and the ceiling on what comes back free. You are not casting one spell off the top; you are buying a pile of exiled cards and casting every instant and sorcery in it under X. Push X high and you risk flipping a hand of lands and creatures that just slide into the graveyard; build a deck stuffed with cheap, low-mana-value spells and the variance becomes a cascade of free effects. The mana-value gate cuts both ways, rewarding decks that stay lean rather than top-heavy, since a bomb finisher costing more than X gets exiled and discarded along with the chaff. There is no targeting, no choice of where in the library to look, no protection against a dead flip: the deck you bring is the only lever you get, and the spell pays out exactly as well as you prepared for it. It belongs to the lineage of "cast a chunk of your library for free" payoffs, the kind that ask you to build the entire deck around making the random reveal reliable, and it sits at the volatile end of that family because the X both fuels and constrains the result in the same breath.