Khalni Hydra 
Creature — Hydra
$13.19 #14079 0.27 16.4 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.
Blasphemous Act79%
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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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"Trample"
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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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$0.38↓#138410.00↓13.9 years↓
"Trample"
Emerald Medallion74%
$4.07↓#586↑0.2028.9 years↑
"Green spells you cast cost less to cast."
less to cast."
Thundering Tanadon74%
$0.17↓#26534↓0.00↓15.3 years↓
"Trample"
Deus of Calamity72%
$0.33↓#19226↓0.3018.3 years↑
"Trample"
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$0.22↓#19356↓0.2818.1 years↑
"Trample"
Primalcrux70%
$4.97↓#18892↓0.06↓18.1 years↑
"This creature's power and toughness are each equal to the number of green mana symbols in the mana costs of permanents you control."
Crabapple Cohort70%
$0.08↓#29591↓0.16↓18.3 years↑
"This creature gets +1/+1 as long as you control another green creature."