Patrician's Scorn 

Instant
If you've cast another white spell this turn, you may cast this spell without paying its mana cost.
Destroy all enchantments.
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Cards that do something similar expected a card that isn't here?
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Hewed Stone Retainers 84%
$0.07#29260
"Cast this spell only if you've cast another spell this turn."
Once Upon a Time 83%
$1.45#8818
"If this spell is the first spell you've cast this game, you may cast it without paying its mana cost."
Celestial Dawn 82%
$0.50#16954
"You may spend white mana as though it were mana of any color. You may spend other mana only as though it were colorless mana."
Fires of Invention 81%
$0.28#14013
"You can cast spells only during your turn and you can cast no more than two spells each turn."
Molten Exhale 80%
$0.15#13599
"You may cast this spell as though it had flash if you behold a Dragon as an additional cost to cast it."
Dragon Man, Reformed Robot 80%
$0.19#26598
"You may cast this card from your graveyard by discarding a card in addition to paying its other costs."
Alien Symbiosis 80%
$0.36#11657
"You may cast this card from your graveyard by discarding a card in addition to paying its other costs."