Curious Obsession {U}
Enchantment — Aura
Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may draw a card."
At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice this Aura.
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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.
See Red 100%
$0.06#26411
"At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice this Aura."
+1 more matching line
Snake Umbra 95%
$1.19#1470
"Enchanted creature gets +1/+1 and has "Whenever this creature deals damage to an opponent, you may draw a card.""
Mad Dog 86%
$0.10#28544
"At the beginning of your end step, if this creature didn't attack or come under your control this turn, sacrifice it."
Curious Inquiry 82%
$0.23#11960
"Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, investigate.""