Scion of Draco 
Artifact Creature — Dragon
$3.39 #4021 0.32 5.5 years
Domain — This spell costs 
less to cast for each basic land type among lands you control.
less to cast for each basic land type among lands you control.Flying
Each creature you control has vigilance if it's white, hexproof if it's blue, lifelink if it's black, first strike if it's red, and trample if it's green.
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Cards similar to Scion of Draco 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.
Stratadon90%
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"This spell costs 
less to cast for each basic land type among lands you control."
less to cast for each basic land type among lands you control."
Yavimaya Sojourner90%
$0.18↓#25401↓0.22↓4.1 years↓
"This spell costs less to cast for each basic land type among lands you control."
less to cast for each basic land type among lands you control."
Draco86%
$3.95↑#10261↓0.12↓25.7 years↑
"This spell costs less to cast for each basic land type among lands you control."
less to cast for each basic land type among lands you control."
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$0.41↓#10397↓0.274.1 years↓
"This spell costs less to cast for each basic land type among lands you control."
less to cast for each basic land type among lands you control."
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"Flying"
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"Flying"
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"Flying"