Counter target spell unless its controller pays {X}. Clash with an opponent. If you win, that spell's controller mills four cards. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)
Legalities
tlrlegal
duellegal
brawlnot legal
pennynot legal
PreDH
Rulings · 2
wotc
The clash (and the result of the clash if you win) happens regardless of whether the targeted spell was countered or {X} was paid.
wotc
The opponent you clash with doesn't have to be the controller of the targeted spell.
Notes
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