Dragonlair Spider 
Creature — Spider
$0.49 #8367 0.31 14.4 years
Reach
Whenever an opponent casts a spell, create a 1/1 green Insect creature token.
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Howling Moon90%
$2.28↑#5615↑0.00↓4.9 years↓
"Whenever an opponent casts their second spell each turn, create a 2/2 green Wolf creature token."
Infested Roothold90%
$0.26↓#23270↓0.2222.7 years↑
"Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect creature token."
Eyes of the Wisent90%
$0.58↑#23049↓0.11↓19.0 years↑
"Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token."
March of the World Ooze89%
$2.08↑#4147↑0.411.7 years↓
"Whenever an opponent casts a spell, if it's not their turn, you create a 3/3 green Elephant creature token."
Noosegraf Mob86%
$0.27↓#11109↓0.13↓10.2 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."
Arasta of the Endless Web85%
$0.22↓#1025↑0.336.7 years↓
"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
+1 more matching line
Solarium Sentry84%
$0.31↓#19077↓0.15↓0.0 years↓
"Whenever an opponent casts a spell with mana value 2 or less, you gain 2 life."
Snake Pit84%
$0.28↓#14073↓0.12↓27.0 years↑
"Whenever an opponent casts a blue or black spell, you may create a 1/1 green Snake creature token."
Monologue Tax83%
$1.47↑#1043↑0.59↑5.5 years↓
"Whenever an opponent casts their second spell each turn, you create a Treasure token."
Taurean Mauler82%
$0.41↓#956↑0.3818.7 years↑
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Mogg Sentry82%
$0.32↓#22626↓0.12↓25.7 years↑
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Citanul Druid80%
$8.33↑#28629↓0.21↓32.6 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Sunscorch Regent78%
$0.31↓#1629↑0.3611.6 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Straw Golem78%
$0.15↓#30399↓0.00↓29.4 years↑
"When an opponent casts a creature spell, sacrifice this creature."
Ishai, Ojutai Dragonspeaker78%
$3.68↑#4727↑0.56↑9.9 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Predatory Hunger78%
$0.61↑#10864↓0.11↓28.3 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Rewards of Diversity78%
$0.43↓#21896↓0.2826.0 years↑
"Whenever an opponent casts a multicolored spell, you gain 4 life."
Kaito, Cunning Infiltrator77%
$2.06↑#4103↑0.291.9 years↓
"−9: You get an emblem with "Whenever a player casts a spell, you create a 2/1 blue Ninja creature token.""
Mangara, the Diplomat76%
$0.36↓#610↑0.366.3 years↓
"Whenever an opponent casts their second spell each turn, draw a card."
Soldier of the Pantheon76%
$0.20↓#17211↓0.4113.1 years↓
"Whenever an opponent casts a multicolored spell, you gain 1 life."