Breath of the Sleepless {3}{U}
Enchantment
You may cast Spirit spells as though they had flash.
Whenever you cast a creature spell during an opponent's turn, tap up to one target creature.
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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.
Supernatural Rescue 88%
$0.10#24400
"This spell has flash as long as you control a Spirit."
+1 more matching line
Elite Skirmisher 88%
$0.16#26789
"Whenever you cast a spell that targets this creature, you may tap target creature."
Iceman and Firestar 84%
$0.50#27612
"Whenever you cast a blue spell, tap up to one target creature."
Geistlight Snare 83%
$0.25#16044
"This spell costs {1} less to cast if you control a Spirit. It also costs {1} less to cast if you control an enchantment."
Heliod, the Radiant Dawn // Heliod, the Warped Eclipse 81%
$2.56#3209
"You may cast spells as though they had flash."