Transcendent Dragon 
Creature — Dragon
$0.35 #7073 0.71 1.5 years
Flash
Flying
When this creature enters, if you cast it, counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard, then you may cast it without paying its mana cost.
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Cards similar to Transcendent Dragon 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.
Thranduil's Decree94%
$0.16↓#16258↓0.33↓0.2 years↓
"Counter target spell. If a permanent spell is countered this way, exile it instead of putting it into its owner's graveyard. You may cast that card without paying its mana cost for as long as it remains exiled."
Spelljack94%
$1.60↑#17041↓0.6824.4 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may play it without paying its mana cost for as long as it remains exiled."
Kheru Spellsnatcher92%
$0.24↓#80220.13↓12.1 years↑
"When this creature is turned face up, counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may cast that card without paying its mana cost for as long as it remains exiled."
Scarlet Witch, Chaotic Avenger80%
$0.38↑#11391↓0.54↓0.3 years↓
"Flying"
Liquify79%
$0.11↓#29437↓0.47↓24.7 years↑
"Counter target spell with mana value 3 or less. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Malcolm, Alluring Scoundrel78%
$1.89↑#1582↑0.31↓2.9 years↑
"Flash"
+1 more matching line
Nightveil Specter78%
$0.53↑#8951↓0.35↓13.7 years↑
"Flying"
Smirking Spelljacker78%
$2.95↑#71140.31↓2.5 years
"When this creature enters, exile target spell an opponent controls."
+1 more matching line
Skyway Robber78%
$0.30↓#16947↓0.33↓4.5 years↑
"Flying"
Dissipate76%
$0.11↓#64830.44↓30.0 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Delay76%
$1.68↑#2258↑0.28↓19.5 years↑
"Counter target spell. If the spell is countered this way, exile it with three time counters on it instead of putting it into its owner's graveyard. If it doesn't have suspend, it gains suspend."
Guile76%
$0.59↑#11868↓0.50↓19.0 years↑
"If a spell or ability you control would counter a spell, instead exile that spell and you may play that card without paying its mana cost."
Void Shatter75%
$0.29↓#12496↓0.53↓10.7 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Deny Existence74%
$0.06↓#19862↓0.35↓10.5 years↑
"Counter target creature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Assert Authority74%
$0.33↓#12344↓0.18↓23.0 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Sweet-Gum Recluse74%
$0.44↑#5067↑0.06↓5.9 years↑
"Flash"
Faerie Trickery72%
$0.75↑#11736↓0.18↓19.0 years↑
"Counter target non-Faerie spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Herald of Amity72%
$0.22↓#10575↓0.07↓0.5 years↓
"Flying"
Gale's Redirection72%
$0.30↓#9375↓0.22↓4.4 years↑
"You may cast the exiled card without paying its mana cost for as long as it remains exiled."
Devious Cover-Up70%
$0.14↓#13090↓0.27↓8.0 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may shuffle up to four target cards from your graveyard into your library."