Curse of Shaken Faith 

Enchantment — Aura Curse
$0.31 #9029 0.59 5.1 years
Enchant player
Whenever enchanted player casts a spell other than the first spell they cast each turn or copies a spell, this Aura deals 2 damage to them.
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Cards similar to Curse of Shaken Faith expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Magebane Lizard74%
$0.95↑#5498↑0.31↓2.5 years↓
"Whenever a player casts a noncreature spell, this creature deals damage to that player equal to the number of noncreature spells they've cast this turn."
Spellshock73%
$2.89↑#5624↑0.80↑28.3 years↑
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."