Arwen's Gift {3}{U}
Sorcery
This spell costs {1} less to cast if you control two or more legendary creatures.
Scry 2, then draw two cards.
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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.
Lashwhip Predator 84%
$0.09#19106
"This spell costs {2} less to cast if your opponents control three or more creatures."
Molten Monstrosity 81%
$0.18#16595
"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
The Skullspore Nexus 81%
$10.76#1591
"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
The Great Henge 81%
$62.97#235
"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
Synchronized Eviction 81%
$0.21#20221
"This spell costs {2} less to cast if you control at least two creatures that share a creature type."
Ghalta, Primal Hunger 81%
$0.99#472
"This spell costs {X} less to cast, where X is the total power of creatures you control."