Renegade Bull 
Creature — Ox
$0.19 #14356 0.00 0.4 years
Trample
Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value.
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.
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Cards similar to Renegade Bull 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.
Demilich92%
$0.51↑#164790.31↑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."
+1 more matching line
Arcane Bombardment92%
$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."
Founding the Third Path89%
$0.21↑#139050.38↑4.0 years↑
"Exile target instant or sorcery card from your graveyard. Copy it. You may cast the copy."
+1 more matching line
Erratic Cyclops88%
$0.15↓#18347↓0.50↑7.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
+1 more matching line
Mizzix's Mastery88%
$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."
Mysterious Stranger88%
$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."
Arcane Proxy87%
$0.42↑#162800.36↑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."
Spelltwine84%
$0.30↑#7742↑0.20↑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 Forgery84%
$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."
Izzet Chemister84%
$0.21↑#132690.50↑9.0 years↑
", 
: Exile target instant or sorcery card from your graveyard."
, : Exile target instant or sorcery card from your graveyard."
Power Pack83%
$0.19#18980↓0.000.2 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."
Surge to Victory83%
$0.30↑#4879↑0.24↑5.4 years↑
"Exile target instant or sorcery card from your graveyard. Creatures you control get +X/+0 until end of turn, where X is that card's mana value. Whenever a creature you control deals combat damage to a player this turn, copy the exiled card. 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."
Wildfire Devils82%
$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."
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."
Roving Actuator82%
$0.13↓#22986↓0.16↑1.1 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."
Fire Urchin80%
$0.07↓#25447↓0.62↑7.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
+1 more matching line
Festival Crasher80%
$0.17↓#19995↓0.22↑4.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Kiln Fiend80%
$0.10↓#169470.27↑16.4 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Scholar of Combustion80%
$0.25↑#23873↓0.13↑1.8 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."