Navigator's Ruin 
Enchantment
$0.08 #22968 0.19 8.9 years
Raid — At the beginning of your end step, if you attacked this turn, target opponent mills four cards.
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Cards similar to Navigator's Ruin 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.
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less to cast if you attacked this turn."
less to cast if you attacked this turn."
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"When this creature enters, target opponent mills two cards."
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"Target opponent mills seven cards."
Deadeye Tormentor72%
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"When this creature enters, if you attacked this turn, target opponent discards a card."
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Admiral's Order71%
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"If you attacked this turn, you may pay rather than pay this spell's mana cost."
rather than pay this spell's mana cost."
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$0.24↑#215420.00↓8.9 years
"At the beginning of your end step, if you attacked this turn, you may draw a card. If you do, discard a card."
Screaming Swarm70%
$0.21↑#17606↑0.53↑4.8 years↓
"Whenever you attack with one or more creatures, target player mills that many cards."