Spelljack 
Instant
$1.55 #16871 0.53 24.3 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. (If it has X in its mana cost, X is 0.)
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Cards similar to Spelljack 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 Decree96%
$0.28↓#191400.00↓0.1 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."
Transcendent Dragon94%
$0.28↓#7186↑0.30↓1.4 years↓
"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."
Kheru Spellsnatcher89%
$0.22↓#7631↑0.06↓11.9 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."
Liquify86%
$0.15↓#29232↓0.17↓24.6 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."
Dissipate82%
$0.11↓#6350↑0.30↓29.9 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Deny Existence82%
$0.06↓#196780.24↓10.4 years↓
"Counter target creature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Void Shatter81%
$0.29↓#12233↑0.10↓10.6 years↓
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Assert Authority80%
$0.29↓#12333↑0.35↓22.9 years↓
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Delay78%
$1.73↑#2154↑0.34↓19.3 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."
Guile78%
$0.80↓#11663↑0.64↑18.9 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."
Syncopate78%
$0.14↓#3799↑0.80↑24.9 years
"Counter target spell unless its controller pays 
. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
No More Lies78%
$0.43↓#5847↑0.17↓2.6 years↓
"Counter target spell unless its controller pays . If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Devious Cover-Up76%
$0.12↓#12894↑0.25↓7.9 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."
Deny the Divine75%
$0.05↓#196440.40↓6.6 years↓
"Counter target creature or enchantment spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Horribly Awry74%
$0.07↓#22088↓0.5310.9 years↓
"Counter target creature spell with mana value 4 or less. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
No Escape73%
$0.15↓#168300.41↓7.3 years↓
"Counter target creature or planeswalker spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Spell Shrivel73%
$0.25↓#167140.4410.9 years↓
"Counter target spell unless its controller pays 
. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Smirking Spelljacker73%
$1.93↑#6995↑0.472.4 years↓
"When this creature enters, exile target spell an opponent controls."
Faerie Trickery72%
$0.95↓#11540↑0.36↓18.9 years↓
"Counter target non-Faerie spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard."
Gale's Redirection72%
$0.33↓#9132↑0.25↓4.2 years↓
"You may cast the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."