Vexing Bauble 
Artifact
$2.98 #1297 0.80 2.3 years
Whenever a player casts a spell, if no mana was spent to cast it, counter that spell.
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Cards similar to Vexing Bauble expected a card that isn't here?
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Void Mirror96%
$0.39↓#15623↓0.895.5 years↑
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Boromir, Warden of the Tower92%
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"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Lavinia, Azorius Renegade92%
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"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Ice Cave86%
$0.74↓#21369↓0.8225.4 years↑
"Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell."
Planar Chaos83%
$2.33↓#7172↓1.35↑24.4 years↑
"Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell."
Chalice of the Void78%
$16.39↑#9424↓1.14↑23.0 years↑
"Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell."