Voracious Greatshark 
Creature — Shark
$0.14 #12194 0.00 6.4 years
Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, counter target artifact or creature spell.
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Cards similar to Voracious Greatshark 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.
Halt Order84%
$0.09↓#28645↓0.0515.9 years↑
"Counter target artifact spell."
Spectral Interference80%
$0.17↑#113410.25↑1.6 years↓
"Counter target artifact or creature spell unless its controller pays 
."
."
Scatter Ray80%
$0.10↓#16214↓0.60↑3.8 years↓
"Counter target artifact or creature spell unless its controller pays ."
."
Artifact Blast78%
$2.31↑#17978↓0.27↑32.5 years↑
"Counter target artifact spell."
Preemptive Strike76%
$6.34↑#28822↓0.29↑27.3 years↑
"Counter target creature spell."
False Summoning76%
$0.21↑#24689↓0.56↑28.2 years↑
"Counter target creature spell."
Essence Scatter76%
$0.07↓#2719↑0.28↑17.1 years↑
"Counter target creature spell."
Strix Serenade76%
$1.93↑#1046↑0.46↑2.2 years↓
"Counter target artifact, creature, or planeswalker spell. Its controller creates a 2/2 blue Bird creature token with flying."
Steel Sabotage74%
$0.23↑#19666↓0.56↑15.6 years↑
"• Counter target artifact spell."
Bone to Ash72%
$0.05↓#139270.20↑14.6 years↑
"Counter target creature spell."
Exclude72%
$0.16↑#9282↑0.0025.9 years↑
"Counter target creature spell."
Minion's Return72%
$0.32↑#5583↑0.53↑6.6 years
"Flash"
Annul71%
$0.14#4604↑0.57↑27.9 years↑
"Counter target artifact or enchantment spell."
Summoner's Bane71%
$0.07↓#23344↓0.0516.9 years↑
"Counter target creature spell. Create a 2/2 blue Illusion creature token."
Weeping Angel70%
$0.38↑#9333↑0.53↑2.9 years↓
"Flash"