Flusterstorm 
Instant
$4.99 #307 0.70 15.2 years
Counter target instant or sorcery spell unless its controller pays 
.
.Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)
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Cards similar to Flusterstorm expected a card that isn't here?
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"Counter target instant or sorcery spell unless its controller pays 
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"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
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"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
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Astral Steel87%
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"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
Diversion Unit86%
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", Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
, Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
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$0.16↓#16074↓0.29↓19.9 years↑
"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
Weather the Storm86%
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"Storm When you cast this spell, copy it for each spell cast before it this turn."
Reaping the Graves84%
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"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
Hunting Pack84%
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"Storm When you cast this spell, copy it for each spell cast before it this turn."
Empty the Warrens84%
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"Storm When you cast this spell, copy it for each spell cast before it this turn."
Chatterstorm84%
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"Storm When you cast this spell, copy it for each spell cast before it this turn."
Tendrils of Agony84%
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"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
Brain Freeze84%
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"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
Lose Focus82%
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"Counter target spell unless its controller pays 
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."+1 more matching line
Scattershot82%
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"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
Radstorm82%
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"Storm When you cast this spell, copy it for each spell cast before it this turn."
Wing Shards82%
$0.10↓#14383↓0.10↓23.3 years↑
"Storm When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies."
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"Counter target sorcery spell."