Cephalid Shrine {1}{U}{U}
Enchantment
Whenever a player casts a spell, counter that spell unless that player pays {X}, where X is the number of cards in all graveyards with the same name as the spell.
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Cards that do something similar 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.
Vexing Bauble 91%
$2.26#1316
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
Ice Cave 91%
$0.80#20895
"Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell."
Void Mirror 90%
$0.32#15339
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Dovescape 89%
$4.38#11894
"Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value."
Bazaar of Wonders 87%
$2.78#28053
"Whenever a player casts a spell, counter it if a card with the same name is in a graveyard or a nontoken permanent with the same name is on the battlefield."
In the Eye of Chaos 85%
#21143
"Whenever a player casts an instant spell, counter it unless that player pays {X}, where X is its mana value."
Lavinia, Azorius Renegade 83%
$0.51#3154
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Boromir, Warden of the Tower 83%
$5.62#837
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Chancellor of the Annex 82%
$2.99#10150
"Whenever an opponent casts a spell, counter it unless that player pays {1}."