Dungeon Descent
Land
This land enters tapped.
{T}: Add {C}.
{4}, {T}, Tap an untapped legendary creature you control: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)
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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.
Selesnya Evangel 88%
$0.22#13489
"{1}, {T}, Tap an untapped creature you control: Create a 1/1 green Saproling creature token."
Unerring Sling 88%
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"{3}, {T}, Tap an untapped creature you control: This artifact deals damage equal to the tapped creature's power to target attacking or blocking creature with flying."
Ranger's Hawk 85%
$0.19#16930
"{3}, {T}, Tap another untapped creature you control: Venture into the dungeon. Activate only as a sorcery."
Town Gossipmonger // Incited Rabble 80%
$0.04#29231
"{T}, Tap an untapped creature you control: Transform this creature."