Dragonlair Spider 
Creature — Spider
$0.47 #8231 0.10 14.3 years
Reach
Whenever an opponent casts a spell, create a 1/1 green Insect creature token.
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Cards similar to Dragonlair Spider 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.
Eyes of the Wisent91%
$0.59↑#22472↓0.25↑18.9 years↑
"Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token."
Infested Roothold90%
$0.26↓#22994↓0.00↓22.6 years↑
"Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect creature token."
Howling Moon90%
$1.80↑#5659↑0.00↓4.8 years↓
"Whenever an opponent casts their second spell each turn, create a 2/2 green Wolf creature token."
March of the World Ooze89%
$1.87↑#4299↑0.31↑1.6 years↓
"Whenever an opponent casts a spell, if it's not their turn, you create a 3/3 green Elephant creature token."
Noosegraf Mob86%
$0.29↓#10793↓0.33↑10.1 years↓
"Whenever a player casts a spell, remove a +1/+1 counter from this creature. If you do, create a 2/2 black Zombie creature token."
Snake Pit86%
$0.32↓#13956↓0.0626.9 years↑
"Whenever an opponent casts a blue or black spell, you may create a 1/1 green Snake creature token."
Arasta of the Endless Web85%
$0.40↓#1017↑0.25↑6.6 years↓
"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
+1 more matching line
Monologue Tax83%
$1.42↑#1088↑0.54↑5.4 years↓
"Whenever an opponent casts their second spell each turn, you create a Treasure token."
Taurean Mauler82%
$0.56↑#947↑0.31↑18.6 years↑
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Mogg Sentry82%
$0.33↓#22304↓0.00↓25.6 years↑
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Citanul Druid80%
$8.63↑#28175↓0.53↑32.5 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Sunscorch Regent78%
$0.30↓#1686↑0.29↑11.4 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Straw Golem78%
$0.16↓#30011↓0.00↓29.2 years↑
"When an opponent casts a creature spell, sacrifice this creature."
Ishai, Ojutai Dragonspeaker78%
$3.29↑#4668↑0.59↑9.8 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
The Queen of Dale78%
$24.38↑#6010↑0.00↓0.1 years↓
"Whenever an opponent casts their first noncreature spell each turn, you recruit."
Predatory Hunger78%
$0.65↑#10710↓0.00↓28.2 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Rewards of Diversity78%
$0.43↓#21851↓0.0625.9 years↑
"Whenever an opponent casts a multicolored spell, you gain 4 life."
Kaito, Cunning Infiltrator77%
$1.90↑#4221↑0.45↑1.8 years↓
"−9: You get an emblem with "Whenever a player casts a spell, you create a 2/1 blue Ninja creature token.""
Soldier of the Pantheon77%
$0.22↓#17142↓0.41↑12.9 years↓
"Whenever an opponent casts a multicolored spell, you gain 1 life."
Warmth76%
$1.06↑#28262↓0.0728.9 years↑
"Whenever an opponent casts a red spell, you gain 2 life."