Imperiosaur {2}{G}{G}
Creature — Dinosaur
Spend only mana produced by basic lands to cast this spell.
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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.
Hagra Mauling // Hagra Broodpit 85%
$0.99#2028
"This spell costs {1} less to cast if an opponent controls no basic lands."
Ore-Scale Guardian 82%
$0.19#26878
"This spell costs {1} less to cast for each land card in your graveyard."
Yuma, Proud Protector 82%
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"This spell costs {1} less to cast for each land card in your graveyard."
Stratadon 82%
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"This spell costs {1} less to cast for each basic land type among lands you control."
Leyline Binding 82%
$0.47#9974
"This spell costs {1} less to cast for each basic land type among lands you control."
Yavimaya Sojourner 82%
$0.11#24616
"This spell costs {1} less to cast for each basic land type among lands you control."