The Pride of Hull Clade {10}{G}
Legendary Creature — Crocodile Elk Turtle
This spell costs {X} less to cast, where X is the total toughness of creatures you control.
Defender
{2}{U}{U}: Until end of turn, target creature you control gets +1/+0, gains "Whenever this creature deals combat damage to a player, draw cards equal to its toughness," and can attack as though it didn't have defender.
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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.
Ghalta, Primal Hunger 91%
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"This spell costs {X} less to cast, where X is the total power of creatures you control."
Volcanic Salvo 91%
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"This spell costs {X} less to cast, where X is the total power of creatures you control."
Orysa, Tide Choreographer 86%
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"This spell costs {3} less to cast if creatures you control have total toughness 10 or greater."
Molten Monstrosity 83%
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"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
The Skullspore Nexus 83%
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"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
The Great Henge 83%
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"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
Spectral Denial 83%
$0.34#8388
"This spell costs {1} less to cast for each creature you control with power 4 or greater."
Wall of Wonder 81%
$0.29#28875
"{2}{U}{U}: This creature gets +4/-4 until end of turn and can attack this turn as though it didn't have defender."
+1 more matching line
Embercleave 81%
$9.62#1324
"This spell costs {1} less to cast for each attacking creature you control."