Prowling Serpopard 
Creature — Cat Snake
$2.98 #3635 0.34 9.4 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%
$1.18↓#12461↓1.40↑25.6 years↑
"Creature spells can't be countered."
Surrak Dragonclaw96%
$2.73↓#32510.3011.9 years↑
"Creature spells you control can't be countered."
+1 more matching line
Leyline of Lifeforce96%
$6.06↑#13118↓0.4020.6 years↑
"Creature spells can't be countered."
Insist93%
$2.06↓#17489↓0.07↓24.6 years↑
"The next creature spell you cast this turn can't be countered."
Frenzied Baloth92%
$1.78↓#2477↑0.441.1 years↓
"Creature spells you control can't be countered."
+1 more matching line
Vexing Shusher90%
$6.27↑#5497↓0.3518.3 years↑
"This spell can't be countered."
+1 more matching line
Rhythm of the Wild89%
$4.27↑#216↑0.417.6 years↓
"Creature spells you control can't be countered."
Sphinx of the Final Word87%
$0.20↓#10087↓0.14↓10.6 years↑
"This spell can't be countered."
+1 more matching line
Root Sliver86%
$6.15↑#6439↓0.3323.6 years↑
"This spell can't be countered."
+1 more matching line
Savage Summoning86%
$2.14↓#9856↓0.3513.1 years↑
"This spell can't be countered."
Chimil, the Inner Sun86%
$9.64↑#759↑0.74↑2.8 years↓
"Spells you control can't be countered."
Spellbreaker Behemoth86%
$0.78↓#10482↓0.13↓17.3 years↑
"This spell can't be countered."
Destiny Spinner82%
$1.06↓#980↑0.296.6 years↓
"Creature and enchantment spells you control can't be countered."
Bound // Determined82%
$0.35↓#24441↓0.3320.3 years↑
"Other spells you control can't be countered this turn."
Hexing Squelcher81%
$21.02↑#636↑0.00↓0.6 years↓
"Spells you control can't be countered."
+1 more matching line
Lier, Disciple of the Drowned81%
$0.96↓#2185↑0.62↑4.9 years↓
"Spells can't be countered."
Allosaurus Shepherd80%
$50.03↑#1681↑0.83↑6.1 years↓
"Green spells you control can't be countered."
+1 more matching line
Malevolent Hermit // Benevolent Geist78%
$1.19↓#42770.354.9 years↓
"Noncreature spells you control can't be countered."
Mistrise Village78%
$7.70↑#393↑0.51↑1.4 years↓
"
, 
: The next spell you cast this turn can't be countered."
, : The next spell you cast this turn can't be countered."
Cunning Nightbonder77%
$0.25↓#10307↓0.256.4 years↓
"Spells with flash you cast cost less to cast and can't be countered."
less to cast and can't be countered."