Insight 
Enchantment
$1.81 #10890 0.32 28.9 years
Whenever an opponent casts a green spell, you draw a card.
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Cards similar to Insight 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.
Freyalise's Charm81%
$0.19↓#29607↓0.00↓31.3 years↑
"Whenever an opponent casts a black spell, you may pay 
. If you do, you draw a card."
. If you do, you draw a card."
Mangara, the Diplomat80%
$0.37↓#612↑0.45↑6.2 years↓
"Whenever an opponent casts their second spell each turn, draw a card."
Wurm's Tooth80%
$0.13↓#14247↓0.3622.6 years↓
"Whenever a player casts a green spell, you may gain 1 life."
Kraum, Ludevic's Opus80%
$3.09↑#6911↑0.67↑9.8 years↓
"Whenever an opponent casts their second spell each turn, draw a card."
Hermit of the Natterknolls // Lone Wolf of the Natterknolls79%
$0.34↓#121550.21↓10.4 years↓
"Whenever an opponent casts a spell during your turn, draw a card."
Wooden Sphere79%
$0.13↓#27015↓0.2733.1 years↑
"Whenever a player casts a green spell, you may pay 
. If you do, you gain 1 life."
. If you do, you gain 1 life."
Reparations78%
$4.80↑#22560↓0.43↑29.9 years↑
"Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card."
Silverquill Silencer78%
$0.20↓#24225↓0.335.4 years↓
"Whenever an opponent casts a spell with the chosen name, they lose 3 life and you draw a card."
Ghostly Pilferer74%
$1.81#1414↑0.326.2 years↓
"Whenever an opponent casts a spell from anywhere other than their hand, draw a card."
Aerial Extortionist74%
$4.61↑#2743↑0.394.4 years↓
"Whenever another player casts a spell from anywhere other than their hand, draw a card."
Titania's Chosen74%
$0.31↓#17141↓0.06↓27.9 years
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Rhystic Study73%
$66.79↑#44↑2.73↑26.3 years↓
"Whenever an opponent casts a spell, you may draw a card unless that player pays ."
."
Dragonlair Spider72%
$0.47↓#8231↑0.10↓14.3 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Nezahal, Primal Tide72%
$8.43↑#1098↑0.80↑8.6 years↓
"Whenever an opponent casts a noncreature spell, draw a card."
River Kelpie71%
$0.31↓#3453↑0.22↓18.3 years↓
"Whenever a player casts a spell from a graveyard, draw a card."
Zenith Chronicler70%
$0.62↓#2679↑0.313.6 years↓
"Whenever a player casts their first multicolored spell each turn, each other player draws a card."
Forced Fruition70%
$3.09↑#2511↑0.97↑18.9 years↓
"Whenever an opponent casts a spell, that player draws seven cards."
Pollywog Prodigy70%
$6.64↑#1151↑0.47↑2.1 years↓
"Whenever an opponent casts a noncreature spell with mana value less than this creature's power, draw a card."