Guardian of the Great Door 

Creature — Angel
As an additional cost to cast this spell, tap four untapped artifacts, creatures, and/or lands you control.
Flying
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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.
Warlord's Elite 91%
$0.03#29319
"As an additional cost to cast this spell, tap two untapped artifacts, creatures, and/or lands you control."