Ghostly Keybearer 

Creature — Spirit
$0.19 #14036 0.00 2.1 years
Flying
Whenever this creature deals combat damage to a player, unlock a locked door of up to one target Room you control.
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Cards similar to Ghostly Keybearer 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.
Rampaging Soulrager78%
$0.09↓#25295↓0.052.1 years
"This creature gets +3/+0 as long as there are two or more unlocked doors among Rooms you control."
Marina Vendrell77%
$0.20↑#8477↑0.002.1 years
"
: Lock or unlock a door of target Room you control. Activate only as a sorcery."