Savage Summoning 
Instant
$2.14 #9856 0.35 13.1 years
This spell can't be countered.
The next creature spell you cast this turn can be cast as though it had flash. That spell can't be countered. That creature enters with an additional +1/+1 counter on it.
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Cards similar to Savage Summoning 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.
Insist84%
$2.06↓#17489↓0.07↓24.6 years↑
"The next creature spell you cast this turn can't be countered."
Gaea's Herald80%
$1.18↓#12461↓1.40↑25.6 years↑
"Creature spells can't be countered."
Prowling Serpopard80%
$2.98↑#3635↑0.349.4 years↓
"Creature spells you control can't be countered."
+1 more matching line
Overmaster76%
$2.61↑#3146↑0.15↓24.6 years↑
"The next instant or sorcery spell you cast this turn can't be countered."
Vexing Shusher76%
$6.27↑#5497↑0.3518.3 years↑
"This spell can't be countered."
+1 more matching line
High Fae Trickster75%
$4.67↑#870↑0.371.8 years↓
"You may cast spells as though they had flash."
Leyline of Lifeforce75%
$6.06↑#13118↓0.4020.6 years↑
"Creature spells can't be countered."
Surrak Dragonclaw74%
$2.73↑#3251↑0.3011.9 years↓
"Creature spells you control can't be countered."
+1 more matching line
Cunning Nightbonder72%
$0.25↓#103070.256.4 years↓
"Spells with flash you cast cost 
less to cast and can't be countered."
less to cast and can't be countered."
Borne Upon a Wind72%
$4.91↑#650↑0.46↑3.2 years↓
"You may cast spells this turn as though they had flash."
Sphinx of the Final Word72%
$0.20↓#100870.14↓10.6 years↓
"Instant and sorcery spells you control can't be countered."
+1 more matching line
Captain Mar-Vell, Space-Born72%
$0.12↓#16756↓0.00↓0.2 years↓
"As long as an opponent has cast a spell this turn, you may cast spells as though they had flash."
Ride the Avalanche72%
$0.39↓#16698↓0.315.1 years↓
"The next spell you cast this turn can be cast as though it had flash. When you next cast a spell this turn, put X +1/+1 counters on up to one target creature, where X is the mana value of that spell."
Scout's Warning72%
$0.78↓#14164↓0.14↓19.3 years↑
"The next creature card you play this turn can be played as though it had flash."
Leyline of Anticipation70%
$3.40↑#735↑0.56↑16.1 years↑
"You may cast spells as though they had flash."
Root Sliver70%
$6.15↑#6439↑0.3323.6 years↑
"This spell can't be countered."
+1 more matching line
Final-Word Phantom70%
$1.97↓#80080.60↑2.6 years↓
"During each opponent's end step, you may cast spells as though they had flash."