Surgical Suite // Hospital Room {1}{W} // {3}{W}
Enchantment — Room // Enchantment — Room
When you unlock this door, return target creature card with mana value 3 or less from your graveyard to the battlefield.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
Whenever you attack, put a +1/+1 counter on target attacking creature.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
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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.
Araña, Heart of the Spider 100%
$0.60#6203
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Ranger Class 100%
$0.43#7487
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Leader's Talent 100%
$0.71#10906
"Whenever you attack, put a +1/+1 counter on target attacking creature."