Chalice of the Void 
Artifact
$16.39 #9268 1.14 22.9 years
This artifact enters with X charge counters on it.
Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell.
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Cards similar to Chalice of the Void 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.
Ice Cave88%
$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 Chaos84%
$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."
Counterbalance84%
$2.58↓#3290↑1.01↓20.1 years↓
"Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card."
Vexing Bauble78%
$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."
Void Mirror78%
$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."
Nether Void78%
$519.01↑#16171↓2.23↑32.3 years↑
"Whenever a player casts a spell, counter it unless that player pays 
."
."
In the Eye of Chaos78%
$193.45↑#21265↓1.30↑32.3 years↑
"Whenever a player casts an instant spell, counter it unless that player pays , where X is its mana value."
, where X is its mana value."
Chancellor of the Annex78%
$2.86↓#101690.80↓15.3 years↓
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Presence of the Master77%
$0.46↓#26110↓1.27↑32.3 years↑
"Whenever a player casts an enchantment spell, counter it."
Decree of Silence76%
$29.75↑#11514↓1.1523.3 years
"Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it."
Dovescape75%
$5.08↓#12061↓1.2120.3 years↓
"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 Wonders75%
$2.52↓#28239↓0.50↓29.9 years↑
"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."
Hesitation73%
$0.30↓#22967↓0.13↓28.5 years↑
"When a player casts a spell, sacrifice this enchantment and counter that spell."
Lunar Force72%
$0.25↓#21116↓0.22↓10.1 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Swindler's Scheme72%
$0.16↓#23086↓0.21↓4.4 years↓
"Whenever an opponent casts a spell from their hand, you may reveal the top card of your library. If it shares a card type with that spell, counter that spell and that opponent may cast the revealed card without paying its mana cost."
Lavinia, Azorius Renegade72%
$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."
Boromir, Warden of the Tower72%
$6.61↓#851↑0.60↓3.2 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Cephalid Shrine71%
$0.29↓#30163↓0.44↓24.9 years↑
"Whenever a player casts a spell, counter that spell unless that player pays , where X is the number of cards in all graveyards with the same name as the spell."
, where X is the number of cards in all graveyards with the same name as the spell."
Jace, Unraveler of Secrets70%
$1.37↓#6632↑0.73↓10.4 years↓
"−8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell.""