Drowned Secrets {1}{U}
Enchantment
Whenever you cast a blue spell, target player mills two cards.
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Cards that do something similar 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.
Diligent Excavator 80%
$0.28#17839
"Whenever you cast a historic spell, target player mills two cards."