Mystical Tether 

Enchantment
$0.07 #20281 0.29 2.5 years
You may cast this spell as though it had flash if you pay
more to cast it.
When this enchantment enters, exile target artifact or creature an opponent controls until this enchantment leaves the battlefield.
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Cards similar to Mystical Tether 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.
Thopter Arrest94%
$0.20↑#239780.279.7 years↑
"When this enchantment enters, exile target artifact or creature an opponent controls until this enchantment leaves the battlefield."
Asinine Antics91%
$0.59↑#8182↑0.56↑3.1 years
"You may cast this spell as though it had flash if you pay
more to cast it."
Harbinger of the Tides90%
$0.24↑#11621↑0.10↓11.3 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Ghitu Fire89%
$0.27↑#229220.07↓26.0 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Stasis Snare88%
$0.10↑#11821↑0.13↓11.0 years↑
"When this enchantment enters, exile target creature an opponent controls until this enchantment leaves the battlefield."
+1 more matching line
Banisher Priest88%
$0.08↑#11673↑0.13↓13.3 years↑
"When this creature enters, exile target creature an opponent controls until this creature leaves the battlefield."
Fairgrounds Warden88%
$0.08↑#185840.05↓10.1 years↑
"When this creature enters, exile target creature an opponent controls until this creature leaves the battlefield."
Saproling Symbiosis88%
$0.46↑#5356↑0.00↓26.0 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Faith Unbroken87%
$0.09↑#11431↑0.11↓10.2 years↑
"When this Aura enters, exile target creature an opponent controls until this Aura leaves the battlefield."
Oakshade Stalker // Moonlit Ambusher87%
$0.22↑#232230.06↓4.9 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Glass Casket86%
$0.06↓#182640.06↓7.0 years↑
"When this artifact enters, exile target creature an opponent controls with mana value 3 or less until this artifact leaves the battlefield."
Dusk Rose Reliquary85%
$0.24↑#9544↑0.40↑2.9 years
"When this artifact enters, exile target artifact or creature an opponent controls until this artifact leaves the battlefield."
Silkwrap85%
$0.10↑#27626↓0.00↓11.6 years↑
"When this enchantment enters, exile target creature with mana value 3 or less an opponent controls until this enchantment leaves the battlefield."
Rout84%
$0.30↑#8157↑0.71↑26.0 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Twilight's Call84%
$0.68↑#14485↑0.10↓26.0 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Vault Guardsman84%
$0.20↑#29739↓0.340.3 years↓
"When this creature enters, exile target artifact or creature an opponent controls until this creature leaves the battlefield."
Breaking Wave84%
$0.69↑#227880.3226.0 years↑
"You may cast this spell as though it had flash if you pay
more to cast it."
Trapped in the Screen82%
$0.16↑#9075↑0.39↑2.1 years
"When this enchantment enters, exile target artifact, creature, or enchantment an opponent controls until this enchantment leaves the battlefield."
Makeshift Binding82%
$0.13↑#16185↑0.292.7 years
"When this enchantment enters, exile target creature an opponent controls until this enchantment leaves the battlefield. You gain 2 life."