Cactarantula 
Creature — Plant Spider
$0.11 #16385 0.16 2.5 years
This spell costs 
less to cast if you control a Desert.
less to cast if you control a Desert.Reach
Whenever this creature becomes the target of a spell or ability an opponent controls, you may draw a card.
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Cards similar to Cactarantula 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.
Warden of the Woods94%
$0.21↑#20293↓0.00↓6.3 years↑
"Whenever this creature becomes the target of a spell or ability an opponent controls, you may draw two cards."
Tenured Concocter92%
$0.10↓#25803↓0.100.5 years↓
"Whenever this creature becomes the target of a spell or ability an opponent controls, you may draw a card."
Shapers' Sanctuary92%
$0.58↑#12069↑0.40↑9.1 years↑
"Whenever a creature you control becomes the target of a spell or ability an opponent controls, you may draw a card."
Old Fat Spider92%
$0.22↑#19879↓0.04↓0.2 years↓
"Whenever this creature becomes the target of a spell or ability an opponent controls, draw a card."
+1 more matching line
Ruric Thar, Biomagus90%
$0.21↑#23468↓0.110.0 years↓
"Whenever this card becomes the target of a spell or ability an opponent controls, draw a card."
Surrak, Elusive Hunter88%
$0.53↑#7191↑0.071.5 years
"Whenever a creature you control or a creature spell you control becomes the target of a spell or ability an opponent controls, draw a card."
Altanak, the Thrice-Called88%
$0.24↑#7475↑0.152.1 years
"Whenever this card becomes the target of a spell or ability an opponent controls, draw a card."
Battle Mammoth88%
$0.45↑#8498↑0.115.7 years↑
"Whenever a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card."
Rayne, Academy Chancellor87%
$0.50↑#20690↓0.06↓27.4 years↑
"Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card. You may draw an additional card if this card is enchanted."
Elrond, Master of Healing80%
$0.38↑#6873↑0.073.3 years
"Whenever a creature you control with a +1/+1 counter on it becomes the target of a spell or ability an opponent controls, you may draw a card."
Fey Steed79%
$0.35↑#175140.155.2 years↑
"Whenever a creature or planeswalker you control becomes the target of a spell or ability an opponent controls, you may draw a card."
Fugitive Druid78%
$0.45↑#31153↓0.04↓29.0 years↑
"Whenever this creature becomes the target of an Aura spell, you draw a card."
Ramunap Hydra77%
$0.38↑#168120.00↓9.3 years↑
"This creature gets +1/+1 as long as you control a Desert."
Reparations76%
$4.70↑#22801↓0.2030.0 years↑
"Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card."
Mila, Crafty Companion // Lukka, Wayward Bonder76%
$1.09↑#8691↑0.115.5 years↑
"Whenever a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card."
Opaline Sliver74%
$2.50↑#10884↑0.94↑20.0 years↑
"All Slivers have "Whenever this permanent becomes the target of a spell an opponent controls, you may draw a card.""
G'raha Tia72%
$0.22↑#12213↑0.00↓1.4 years↓
"Reach"
Bugenhagen, Wise Elder70%
$0.41↑#2436↑0.231.4 years↓
"Reach"
Ms. Marvel, Elastic Ally70%
$0.22↑#27256↓0.180.3 years↓
"Reach"
Dragonlair Spider70%
$0.49↑#8367↑0.31↑14.4 years↑
"Reach"