Chalice of the Void 
Artifact
$16.39 #9424 1.14 23.0 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%
$0.74↓#21369↓0.82↓25.4 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 Chaos84%
$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."
Counterbalance84%
$2.51↓#3414↑1.00↓20.2 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%
$2.98↓#1297↑0.80↓2.3 years↓
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
Void Mirror78%
$0.39↓#15623↓0.89↓5.5 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Nether Void78%
$673.40↑#16326↓2.18↑32.4 years↑
"Whenever a player casts a spell, counter it unless that player pays 
."
."
In the Eye of Chaos78%
$196.62↑#21499↓1.61↑32.4 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%
$3.18↓#101651.43↑15.4 years↓
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Presence of the Master77%
$0.55↓#26381↓1.30↑32.4 years↑
"Whenever a player casts an enchantment spell, counter it."
Decree of Silence76%
$21.71↑#11742↓1.1623.4 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%
$4.96↓#12240↓1.42↑20.5 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%
$2.60↓#28491↓0.38↓30.0 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%
$0.31↓#23370↓0.60↓28.6 years↑
"When a player casts a spell, sacrifice this enchantment and counter that spell."
Lunar Force72%
$0.28↓#21452↓0.35↓10.2 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Swindler's Scheme72%
$0.18↓#23391↓0.44↓4.5 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%
$0.27↓#3214↑1.107.7 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Boromir, Warden of the Tower72%
$4.45↓#874↑0.64↓3.3 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Cephalid Shrine71%
$0.36↓#30496↓0.18↓25.1 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%
$2.73↓#5914↑0.41↓10.5 years↓
"−8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell.""