Renegade Bull 
Creature — Ox
$0.19 #13875 0.08 0.5 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?
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Erratic Cyclops91%
$0.15↓#18693↓0.19↑8.0 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
Arcane Bombardment90%
$5.23↑#2351↑0.52↑4.5 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."
Demilich90%
$0.49↑#16758↓0.46↑5.2 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
Founding the Third Path88%
$0.26↑#142050.124.1 years↑
"Exile target instant or sorcery card from your graveyard. Copy it. You may cast the copy."
+1 more matching line
Mysterious Stranger87%
$0.33↑#9323↑0.43↑2.6 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 Proxy86%
$0.42↑#166070.063.9 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."
Mizzix's Mastery86%
$4.35↑#821↑0.81↑10.9 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."
Fire Urchin85%
$0.05↓#25748↓0.008.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
+1 more matching line
Festival Crasher85%
$0.18↓#20255↓0.005.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Kiln Fiend85%
$0.11↓#17248↓0.0616.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Aven Wind Mage84%
$0.11↓#23341↓0.33↑8.3 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Wee Dragonauts84%
$0.06↓#18706↓0.28↑20.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists84%
$0.03↓#26102↓0.0610.2 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Spelltwine82%
$0.29↑#7827↑0.1214.3 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."
Wildfire Devils82%
$0.20↑#6948↑0.26↑7.2 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."
Izzet Chemister82%
$0.22↑#135700.19↑9.2 years↑
", 
: Exile target instant or sorcery card from your graveyard."
, : Exile target instant or sorcery card from your graveyard."
Surge to Victory82%
$0.30↑#4736↑0.37↑5.5 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."
Flawless Forgery82%
$0.28↑#17914↓0.144.5 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."
Power Pack82%
$0.21↑#18135↓0.43↑0.3 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."
Psionic Ritual80%
$0.32↑#10367↑0.24↑4.4 years↑
"Exile target instant or sorcery card from a graveyard and copy it. You may cast the copy without paying its mana cost."