Run Behind {3}{U}
Instant
This spell costs {1} less to cast if it targets an attacking creature.
Target creature's owner puts it on their choice of the top or bottom of their library.
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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.
Dire Downdraft 100%
$0.06#16282
"Target creature's owner puts it on their choice of the top or bottom of their library."
+1 more matching line
Uncharted Voyage 100%
$0.06#17460
"Target creature's owner puts it on their choice of the top or bottom of their library."
Misleading Motes 100%
$0.04#25948
"Target creature's owner puts it on their choice of the top or bottom of their library."
Return to the Sewers 99%
$0.09#21799
"Target creature's owner puts it on their choice of the top or bottom of their library. You create a Mutagen token."
Revenge of the Drowned 99%
$0.14#21443
"Target creature's owner puts it on their choice of the top or bottom of their library. You create a 2/2 black Zombie creature token with decayed."
Bury in Books 92%
$0.17#20825
"This spell costs {2} less to cast if it targets an attacking creature."
Ephara's Dispersal 92%
$0.31#10728
"This spell costs {2} less to cast if it targets an attacking creature."
Accursed Witch // Infectious Curse 83%
$0.27#10487
"Spells your opponents cast that target this creature cost {1} less to cast."
Swat Away 80%
$0.19#18332
"This spell costs {2} less to cast if a creature is attacking you."
+1 more matching line