Sphinx of the Final Word 
Creature — Sphinx
$0.20 #10087 0.14 10.6 years
This spell can't be countered.
Flying
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Instant and sorcery spells you control can't be countered.
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Cards similar to Sphinx of the Final Word 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.
Overmaster95%
$2.61↑#3146↑0.1524.6 years↑
"The next instant or sorcery spell you cast this turn can't be countered."
Pteramander86%
$0.21↑#16045↓0.00↓7.6 years↓
"Flying"
Taigam, Ojutai Master82%
$0.39↑#95220.069.0 years↓
"Instant, sorcery, and Dragon spells you control can't be countered."
Prowling Serpopard82%
$2.98↑#3635↑0.34↑9.4 years↓
"Creature spells you control can't be countered."
+1 more matching line
Sphinx of Forgotten Lore81%
$0.36↑#89650.231.8 years↓
"Flying"
Gaea's Herald80%
$1.18↑#12461↓1.40↑25.6 years↑
"Creature spells can't be countered."
Vexing Shusher79%
$6.27↑#5497↑0.35↑18.3 years↑
"This spell can't be countered."
+1 more matching line
Exquisite Firecraft78%
$0.30↑#19526↓0.00↓11.1 years
"If there are two or more instant and/or sorcery cards in your graveyard, this spell can't be countered."
Lier, Disciple of the Drowned78%
$0.96↑#2185↑0.62↑4.9 years↓
"Spells can't be countered."
Leyline of Lifeforce78%
$6.06↑#13118↓0.40↑20.6 years↑
"Creature spells can't be countered."
Surrak Dragonclaw77%
$2.73↑#3251↑0.30↑11.9 years↑
"Creature spells you control can't be countered."
+1 more matching line
Insist76%
$2.06↑#17489↓0.0724.6 years↑
"The next creature spell you cast this turn can't be countered."
Boseiju, Who Shelters All76%
$13.90↑#2755↑0.37↑21.9 years↑
"
, Pay 2 life: Add 
. If that mana is spent on an instant or sorcery spell, that spell can't be countered."
, Pay 2 life: Add . If that mana is spent on an instant or sorcery spell, that spell can't be countered."
Root Sliver74%
$6.15↑#6439↑0.33↑23.6 years↑
"This spell can't be countered."
+1 more matching line
Savage Summoning73%
$2.14↑#98560.35↑13.1 years↑
"This spell can't be countered."
Spellbreaker Behemoth72%
$0.78↑#104820.1317.3 years↑
"This spell can't be countered."
Ascended Lawmage72%
$0.05↓#25653↓0.2113.3 years↑
"Hexproof"
+1 more matching line
Nightveil Predator72%
$0.22↑#111340.097.9 years↓
"Hexproof"
Aven Fleetwing72%
$0.08↓#23937↓0.0615.1 years↑
"Hexproof"
Soul of the Rapids72%
$0.07↓#28499↓0.058.6 years↓
"Hexproof"