Insight 

Enchantment
Whenever an opponent casts a green spell, you draw a card.
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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.
Hermit of the Natterknolls // Lone Wolf of the Natterknolls 88%
$0.29#11973
"Whenever an opponent casts a spell during your turn, draw a card."
Mangara, the Diplomat 86%
$0.25#616
"Whenever an opponent casts their second spell each turn, draw a card."
Kraum, Ludevic's Opus 86%
#6811
"Whenever an opponent casts their second spell each turn, draw a card."
Ghostly Pilferer 86%
$3.49#1404
"Whenever an opponent casts a spell from anywhere other than their hand, draw a card."
Rhystic Study 86%
$70.26#44
"Whenever an opponent casts a spell, you may draw a card unless that player pays {1}."
Wavebreak Hippocamp 84%
$0.83#2329
"Whenever you cast your first spell during each opponent's turn, draw a card."