Khalni Hydra 
Creature — Hydra
$13.48 #14249 0.13 16.5 years
This spell costs less to cast for each green creature you control.
less to cast for each green creature you control.Trample
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Cards similar to Khalni Hydra 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.
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"This spell costs 
less to cast for each creature on the battlefield."
less to cast for each creature on the battlefield."
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less to cast for each creature on the battlefield."
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"Green spells you cast cost less to cast."
less to cast."
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"This creature's power and toughness are each equal to the number of green mana symbols in the mana costs of permanents you control."
+1 more matching line
Crabapple Cohort70%
$0.11↓#29891↓0.00↓18.5 years↑
"This creature gets +1/+1 as long as you control another green creature."