Spell Rupture {1}{U}
Instant
Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.
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Cards that do something similar expected a card that isn't here?
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Thassa's Rebuff 96%
$0.21#14837
"Counter target spell unless its controller pays {X}, where X is your devotion to blue."
Rethink 96%
$0.14#22718
"Counter target spell unless its controller pays {X}, where X is its mana value."
Rakshasa's Disdain 92%
$0.07#18462
"Counter target spell unless its controller pays {1} for each card in your graveyard."
Countervailing Winds 92%
$0.24#8952
"Counter target spell unless its controller pays {1} for each card in your graveyard."
Circular Logic 92%
$0.20#7416
"Counter target spell unless its controller pays {1} for each card in your graveyard."
Rune Snag 91%
$0.10#28445
"Counter target spell unless its controller pays {2} plus an additional {2} for each card named this card in each graveyard."
Jwari Disruption // Jwari Ruins 91%
$0.42#2704
"Counter target spell unless its controller pays {1}."
Syncopate 90%
$0.28#3891
"Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Silumgar's Scorn 90%
$0.27#12893
"Counter target spell unless its controller pays {1}. If you revealed a Dragon card or controlled a Dragon as you cast this spell, counter that spell instead."