Prowling Serpopard 
Creature — Cat Snake
$3.89 #3688 0.45 9.5 years
This spell can't be countered.
Creature spells you control can't be countered.
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Cards similar to Prowling Serpopard 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.
Gaea's Herald98%
$1.06↓#12680↓0.5125.7 years↑
"Creature spells can't be countered."
Surrak Dragonclaw96%
$2.80↓#33310.5112.1 years↑
"Creature spells you control can't be countered."
+1 more matching line
Leyline of Lifeforce94%
$5.97↑#13322↓0.62↑20.7 years↑
"Creature spells can't be countered."
Insist93%
$2.06↓#17782↓0.07↓24.7 years↑
"The next creature spell you cast this turn can't be countered."
Frenzied Baloth92%
$2.06↓#2275↑0.491.2 years↓
"Creature spells you control can't be countered."
+1 more matching line
Vexing Shusher90%
$5.45↑#5740↓0.80↑18.5 years↑
"This spell can't be countered."
+1 more matching line
Rhythm of the Wild89%
$4.32↑#223↑0.487.7 years↓
"Creature spells you control can't be countered."
Savage Summoning86%
$2.51↓#9804↓0.4713.3 years↑
"This spell can't be countered."
Root Sliver86%
$6.03↑#6463↓0.88↑23.7 years↑
"This spell can't be countered."
+1 more matching line
Sphinx of the Final Word86%
$0.53↓#8694↓0.56↑10.7 years↑
"This spell can't be countered."
+1 more matching line
Chimil, the Inner Sun86%
$7.85↑#743↑0.73↑2.9 years↓
"Spells you control can't be countered."
Spellbreaker Behemoth86%
$0.76↓#10654↓0.19↓17.5 years↑
"This spell can't be countered."
Destiny Spinner82%
$1.09↓#1041↑0.406.7 years↓
"Creature and enchantment spells you control can't be countered."
Bound // Determined82%
$0.41↓#24813↓0.06↓20.5 years↑
"Other spells you control can't be countered this turn."
Hexing Squelcher81%
$19.61↑#569↑1.12↑0.7 years↓
"Spells you control can't be countered."
+1 more matching line
Lier, Disciple of the Drowned81%
$1.23↓#2183↑0.58↑5.1 years↓
"Spells can't be countered."
Allosaurus Shepherd80%
$50.90↑#1677↑0.83↑6.3 years↓
"Green spells you control can't be countered."
+1 more matching line
Mistrise Village78%
$7.09↑#374↑0.441.5 years↓
"
, 
: The next spell you cast this turn can't be countered."
, : The next spell you cast this turn can't be countered."
Cunning Nightbonder78%
$0.30↓#10415↓0.62↑6.5 years↓
"Spells with flash you cast cost less to cast and can't be countered."
less to cast and can't be countered."
Malevolent Hermit // Benevolent Geist77%
$0.98↓#44100.19↓5.1 years↓
"Noncreature spells you control can't be countered."