Vexing Bauble 
Artifact
$2.17 #1304 0.51 2.2 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?
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.
Void Mirror96%
$0.37↓#15611↓1.00↑5.3 years↑
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Boromir, Warden of the Tower92%
$6.61↑#851↑0.603.2 years
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Lavinia, Azorius Renegade92%
$0.18↓#3183↓0.91↑7.6 years↑
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Ice Cave86%
$0.77↓#21126↓0.92↑25.3 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%
$2.31↑#7147↓1.41↑24.3 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↑#9268↓1.14↑22.9 years↑
"Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell."