Arasta of the Endless Web 
Legendary Enchantment Creature — Spider
$0.22 #1025 0.33 6.7 years
Reach
Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach.
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Dragonlair Spider85%
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"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
+1 more matching line
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"Whenever enchanted player casts an instant or sorcery spell, each other player may copy that spell and may choose new targets for the copy they control."
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"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
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"Each opponent can't cast instant or sorcery spells during that player's next turn."
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"Whenever an opponent casts an instant or sorcery spell, they may pay . If they don't, you may copy that spell. You may choose new targets for the copy."
. If they don't, you may copy that spell. You may choose new targets for the copy."
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"Reach"
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"Reach"