Wildfire Devils 

Creature — Devil
$0.25 #6793 0.10 7.0 years
When this creature enters and at the beginning of your upkeep, choose a player at random. That player exiles an instant or sorcery card from their graveyard. Copy that card. You may cast the copy without paying its mana cost.
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Cards similar to Wildfire Devils 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.
Mysterious Stranger92%
$0.31↑#9193↓0.55↑2.5 years↓
"When this creature enters, for each graveyard with an instant or sorcery card in it, exile target instant or sorcery card from that graveyard. If two or more cards are exiled this way, choose one of them at random and copy it. You may cast the copy without paying its mana cost."
Spelltwine87%
$0.30↑#77420.20↑14.1 years↑
"Exile target instant or sorcery card from your graveyard and target instant or sorcery card from an opponent's graveyard. Copy those cards. Cast the copies if able without paying their mana costs. Exile this card."
Flawless Forgery86%
$0.29↑#17455↓0.56↑4.4 years↓
"Exile target instant or sorcery card from an opponent's graveyard. Copy that card. You may cast the copy without paying its mana cost."
Mizzix's Mastery84%
$4.43↑#807↑0.65↑10.8 years↑
"Exile target card that's an instant or sorcery from your graveyard. For each card exiled this way, copy it, and you may cast the copy without paying its mana cost. Exile this card."
Arcane Bombardment84%
$5.66↑#2291↑0.38↑4.4 years↓
"Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment. You may cast any number of the copies without paying their mana costs."
Mnemonic Deluge82%
$7.64↑#3766↑0.52↑5.8 years↓
"Exile target instant or sorcery card from a graveyard. Copy that card three times. You may cast the copies without paying their mana costs. Exile this card."
Renegade Bull82%
$0.19↓#14356↓0.00↓0.4 years↓
"Whenever this creature attacks, exile up to one target instant or sorcery card from your graveyard and copy it. You may cast the copy without paying its mana cost."
Psionic Ritual82%
$0.36↑#10075↓0.44↑4.2 years↓
"Exile target instant or sorcery card from a graveyard and copy it. You may cast the copy without paying its mana cost."
Arcane Proxy80%
$0.42↑#16280↓0.36↑3.8 years↓
"When this creature enters, if you cast it, exile target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard. Copy that card. You may cast the copy without paying its mana cost."
Founding the Third Path78%
$0.21↓#13905↓0.38↑4.0 years↓
"Exile target instant or sorcery card from your graveyard. Copy it. You may cast the copy."
Bloodthirsty Adversary78%
$0.35↑#14496↓0.35↑4.9 years↓
"When this creature enters, you may pay 
any number of times. When you pay this cost one or more times, put that many +1/+1 counters on this creature, then exile up to that many target instant and/or sorcery cards with mana value 3 or less from your graveyard and copy them. You may cast any number of the copies without paying their mana costs."
Roving Actuator77%
$0.13↓#22986↓0.161.1 years↓
"When this creature enters, if a nonland permanent left the battlefield this turn or a spell was warped this turn, exile up to one target instant or sorcery card with mana value 2 or less from your graveyard. Copy it. You may cast the copy without paying its mana cost."
Demilich76%
$0.51↑#16479↓0.31↑5.1 years↓
"Whenever this creature attacks, exile up to one target instant or sorcery card from your graveyard. Copy it. You may cast the copy."
Spellweaver Volute76%
$1.18↑#18564↓0.50↑19.3 years↑
"Whenever you cast a sorcery spell, copy the enchanted instant card. You may cast the copy without paying its mana cost. If you do, exile the enchanted card and attach this Aura to another instant card in a graveyard."
Spellweaver Helix76%
$2.62↑#11125↓0.35↑22.9 years↑
"When this artifact enters, you may exile two target sorcery cards from a single graveyard."
Power Pack74%
$0.19↓#18980↓0.00↓0.2 years↓
"Whenever this card deals combat damage to a player, exile target instant or sorcery card from your graveyard chosen at random. At the beginning of your next upkeep, you may cast that card without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Scholar of Combustion74%
$0.25#23873↓0.131.8 years↓
"When this creature enters, exile up to one target instant or sorcery card from your graveyard. You may cast that card until the end of your next turn."
Reversal of Fortune74%
$3.75↑#21041↓0.45↑22.3 years↑
"Target opponent reveals their hand. You may copy an instant or sorcery card in it. If you do, you may cast the copy without paying its mana cost."
Wizard's Spellbook74%
$0.36↑#9017↓0.68↑5.1 years↓
"
: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery."