Thrill of Possibility 
Instant
$0.27 #211 0.08 6.9 years
As an additional cost to cast this spell, discard a card.
Draw two cards.
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Cards similar to Thrill of Possibility 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.
Wild Guess100%
$0.12↓#9236↓0.50↑14.1 years↑
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Tormenting Voice100%
$0.05↓#1865↓0.0711.9 years↑
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Quarrel's End98%
$0.17↓#10571↓0.25↑3.2 years↓
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Electric Revelation96%
$0.13↓#5446↓0.174.9 years↓
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Laughing Mad96%
$0.23↓#2298↓0.24↑1.2 years↓
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Grab the Prize96%
$0.61↑#1435↓0.131.9 years↓
"As an additional cost to cast this spell, discard a card."
Demand Answers96%
$0.45↑#414↓0.102.6 years↓
"Draw two cards."
+1 more matching line
Honor the God-Pharaoh95%
$0.08↓#14342↓0.007.3 years
"As an additional cost to cast this spell, discard a card."
Pirate's Pillage94%
$0.78↑#1639↓0.118.6 years↑
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Unexpected Windfall94%
$3.34↑#279↓0.21↑5.1 years↓
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Big Score92%
$0.38↑#138↑0.114.4 years↓
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Seize the Spoils92%
$0.27#782↓0.105.6 years↓
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Sazacap's Brew90%
$0.19↓#3916↓0.002.1 years↓
"As an additional cost to cast this spell, discard a card."
Magmatic Insight90%
$0.12↓#6206↓0.0011.1 years↑
"As an additional cost to cast this spell, discard a land card."
+1 more matching line
Cathartic Reunion84%
$0.15↓#1091↓0.089.9 years↑
"As an additional cost to cast this spell, discard two cards."
+1 more matching line
Pop Quiz72%
$0.15↓#24894↓0.005.4 years↓
"Draw a card."