Overmaster 
Sorcery
$1.99 #3173 0.27 24.7 years
The next instant or sorcery spell you cast this turn can't be countered.
Draw a card.
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Cards similar to Overmaster 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.
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"Instant and sorcery spells you control can't be countered."
Insist86%
$2.06↑#17782↓0.07↓24.7 years
"The next creature spell you cast this turn can't be countered."
+1 more matching line
Eyes of Gitaxias84%
$0.11↓#20930↓0.00↓3.5 years↓
"Draw a card."
Contentious Plan84%
$0.37↓#2198↑0.14↓7.5 years↓
"Draw a card."
Steady Progress84%
$0.26↓#5093↓0.06↓16.1 years↓
"Draw a card."
Revitalize81%
$0.15↓#4223↓0.03↓8.3 years↓
"Draw a card."
Reviving Dose81%
$0.06↓#22114↓0.00↓26.0 years↑
"Draw a card."
Ritual of Rejuvenation81%
$0.18↓#18511↓0.07↓9.1 years↓
"Draw a card."
Resupply81%
$0.04↓#27158↓0.2211.6 years↓
"Draw a card."
Dosan's Oldest Chant81%
$0.08↓#27651↓0.14↓21.4 years↓
"Draw a card."
Healing Hands80%
$0.19↓#19707↓0.00↓11.3 years↓
"Draw a card."
Mental Note80%
$6.75↑#10635↓0.1824.4 years
"Draw a card."
Rebellious Strike80%
$0.24↓#9327↓0.00↓1.5 years↓
"Draw a card."
Twisted Image80%
$0.22↓#7034↓0.2916.1 years↓
"Draw a card."
Honor80%
$0.29↓#6549↓0.00↓1.2 years↓
"Draw a card."
Defiant Strike80%
$0.10↓#5729↓0.00↓12.1 years↓
"Draw a card."
Sugar Rush80%
$0.23↓#15039↓0.06↓3.1 years↓
"Draw a card."
Taigam, Ojutai Master79%
$0.36↓#9772↓0.76↑9.2 years↓
"Instant, sorcery, and Dragon spells you control can't be countered."
Inside Out79%
$0.19↓#21084↓0.12↓18.2 years↓
"Draw a card."
Crash Through79%
$0.15↓#2060↑0.12↓9.3 years↓
"Draw a card."