Hit the Mother Lode

Discover 10 is the highest number the mechanic carries, and it exists to be a ceiling nobody clears by accident. Because you dig until you exile a nonland card with mana value 10 or less, a hit is nearly guaranteed, and casting that card for free is the obvious prize; the Treasure clause is the quieter piece of engineering. The tokens scale to the gap between 10 and whatever you flip, so cheap hits pay you back for their smallness: reveal a two-drop and you bank eight Treasure toward the next big swing, reveal a genuine ten-drop and you get the spell alone. That inverse relationship is what pulls the card out of pure feast-or-famine. It is a scratcher that cashes either way, and the seven mana with a triple-red pip is the toll: you are spending a full turn and a mono-red-leaning color commitment on the pull. The design lives on the seam between variance and insurance, with Treasure as the insurance, converting a low flip into ramp rather than a wasted sorcery. Discover's exile-until-you-hit structure caps the reward at whatever your deck actually runs, so the free cast is only as good as the expensive nonlands you have stocked to be found; the raw number 10 does none of that work on its own.