Mind Grind

The mill that scales with land density rather than a flat number, which is the entire reason it behaves so differently from a fixed effect. Most library-attack cards bury a set quantity; this one digs until it has dumped X land cards from each opponent, so the actual count lost depends on how lean a deck runs. Against a spell-heavy deck running few lands, a moderate X tears deep, chewing through huge swaths to find its land count; against a land-dense manabase it hits those lands quickly and mills proportionally less. That variance, where the same X empties wildly different amounts from one opponent to the next depending on their curve, is the part of the design that does the real work. The X-spell shell means it wants to be cast late, dumped for everything you have left, and it rewards patience the way most overload-style finishers do: a small X is a polite nibble, a large X is a deck-erasing haymaker. The clause "X can't be 0" closes the obvious loophole of a free no-op, forcing every cast to commit at least one land's worth of milling and the mana that buys it. As a payoff it sits in an awkward spot: too slow to function as disruption, too dependent on the late game to race, but genuinely terrifying as a one-shot win condition when you have ten or twelve mana and a library to empty in a single resolution.