Cathedral of Serra
Land
White legendary creatures you control have "bands with other legendary creatures." (Any legendary creatures can attack in a band as long as at least one has "bands with other legendary creatures." Bands are blocked as a group. If at least two legendary creatures you control, one of which has "bands with other legendary creatures," are blocking or being blocked by the same creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)
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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.
Unholy Citadel 85%
$5.81#25707
"Black legendary creatures you control have "bands with other legendary creatures.""
Seafarer's Quay 83%
$9.12#25903
"Blue legendary creatures you control have "bands with other legendary creatures.""