Panoptic Mirror 
Artifact
$25.49 #10190 1.16 22.6 years
Imprint —
,
: You may exile an instant or sorcery card with mana value X from your hand.
At the beginning of your upkeep, you may copy a card exiled with this artifact. If you do, you may cast the copy without paying its mana cost.
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Cards similar to Panoptic Mirror 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.
Isochron Scepter92%
$8.09↓#744↑1.40↑22.9 years
"
,
: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost."
+1 more matching line
Elite Arcanist92%
$0.28↓#17315↓0.24↓13.1 years↓
"
,
: Copy the exiled card. You may cast the copy without paying its mana cost. X is the mana value of the exiled card."
+1 more matching line
Arcane Savant88%
$0.16↓#30550↓0.20↓10.0 years↓
"When this creature enters, copy a card you exiled with cards named this card. You may cast the copy without paying its mana cost."
+1 more matching line
Spellbinder84%
$6.39↓#15275↓0.38↓22.6 years
"Whenever equipped creature deals combat damage to a player, you may copy the exiled card. If you do, you may cast the copy without paying its mana cost."
+1 more matching line
Omnispell Adept82%
$0.23↓#19012↓0.41↓7.9 years↓
"
,
: You may cast an instant or sorcery spell from your hand without paying its mana cost."
Chandra, Pyromaster78%
$0.46↓#13002↓0.12↓13.1 years↓
"−7: Exile the top ten cards of your library. Choose an instant or sorcery card exiled this way and copy it three times. You may cast the copies without paying their mana costs."
Eye of the Storm78%
$1.30↓#115910.94↓20.9 years↓
"Whenever a player casts an instant or sorcery card, exile it. Then that player copies each instant or sorcery card exiled with this enchantment. For each copy, the player may cast the copy without paying its mana cost."
Spellweaver Helix76%
$2.62↓#111250.35↓22.9 years
"Whenever a player casts a card, if it has the same name as one of the cards exiled with this artifact, you may copy the other. If you do, you may cast the copy without paying its mana cost."
River Song's Diary76%
$0.51↓#6073↑0.20↓2.9 years↓
"At the beginning of your upkeep, if there are four or more cards exiled with this artifact, choose one of them at random. You may cast it without paying its mana cost."
+1 more matching line
Shell of the Last Kappa74%
$0.68↓#22109↓0.53↓21.9 years
"
,
: Exile target instant or sorcery spell that targets you."
+1 more matching line
Zaffai and the Tempests74%
$0.23↓#12693↓0.00↓0.4 years↓
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Wizard's Spellbook72%
$0.36↓#90170.68↓5.1 years↓
"Copy each card exiled with this artifact. You may cast any number of the copies without paying their mana costs."
+1 more matching line
Living Lore72%
$0.11↓#23533↓0.00↓11.4 years↓
"Whenever this creature deals combat damage, you may sacrifice it. If you do, you may cast the exiled card without paying its mana cost."
+1 more matching line
Izzet Chemister72%
$0.21↓#13269↓0.50↓9.0 years↓
"
,
: Exile target instant or sorcery card from your graveyard."
+1 more matching line
Meletis Charlatan72%
$0.15↓#21335↓0.12↓12.9 years↓
"
,
: The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy."
Chandra, Hope's Beacon72%
$2.10↓#4183↑0.28↓3.4 years↓
"+1: Exile the top five cards of your library. Until the end of your next turn, you may cast an instant or sorcery spell from among those exiled cards."
Brain in a Jar72%
$0.30↓#18850↓0.07↓10.4 years↓
"
,
: Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost."
Forger's Foundry71%
$0.34↓#93340.45↓2.4 years↓
"

,
: You may cast any number of spells from among cards exiled with this artifact without paying their mana costs. Activate only as a sorcery."
+1 more matching line
Goliath Daydreamer71%
$0.28↓#98000.00↓0.6 years↓
"Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost."
+1 more matching line