Nullstone Gargoyle 
Artifact Creature — Gargoyle
$2.39 #14992 1.26 21.0 years
Flying
Whenever the first noncreature spell of a turn is cast, counter that spell.
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Cards similar to Nullstone Gargoyle 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.
Dovescape82%
$4.96↑#122401.42↑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."
Permission Denied78%
$14.02↑#4358↑1.05↓2.9 years↓
"Counter target noncreature spell. Your opponents can't cast noncreature spells this turn."
Stronghold Machinist74%
$0.27↓#21587↓0.32↓26.7 years↑
"
,
, Discard a card: Counter target noncreature spell."
Ice Cave74%
$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."
Null Brooch72%
$7.12↑#146950.22↓28.3 years↑
"
,
, Discard your hand: Counter target noncreature spell."
Lavinia, Azorius Renegade70%
$0.27↓#3214↑1.10↓7.7 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."