Hazoret's Undying Fury 
Sorcery
$0.26 #24004 0.23 9.1 years
Shuffle your library, then exile the top four cards. You may cast any number of spells with mana value 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step.
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Cards similar to Hazoret's Undying Fury expected a card that isn't here?
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Dance with Calamity88%
$0.29↑#4272↑0.50↑3.4 years↓
"Shuffle your library. As many times as you choose, you may exile the top card of your library. If the total mana value of the cards exiled this way is 13 or less, you may cast any number of spells from among those cards without paying their mana costs."
Solstice Revelations84%
$0.20↓#7153↑0.00↓0.8 years↓
"Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost if the spell's mana value is less than the number of Mountains you control. If you don't cast that card this way, put it into your hand."
Improvisation Capstone82%
$10.94↑#2932↑0.00↓0.4 years↓
"Exile cards from the top of your library until you exile cards with total mana value 4 or greater. You may cast any number of spells from among them without paying their mana costs."
Villainous Wealth80%
$0.29↑#2406↑0.63↑11.9 years↑
"Target opponent exiles the top X cards of their library. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Creative Technique80%
$0.28↑#4783↑0.50↑5.4 years↓
"Shuffle your library, then reveal cards from the top of it until you reveal a nonland card. Exile that card and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost."
Primeval Spawn80%
$0.43↑#10563↑0.36↑4.0 years↓
"When this creature leaves the battlefield, exile the top ten cards of your library. You may cast any number of spells with total mana value 10 or less from among them without paying their mana costs."
Discover the Impossible80%
$0.19↓#18389↑0.06↓4.5 years↓
"Look at the top five cards of your library. Exile one of them face down and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost if it's an instant spell with mana value 2 or less. If you don't, put that card into your hand."
Epic Experiment79%
$0.28↑#6185↑0.42↑13.9 years↑
"Exile the top X cards of your library. You may cast instant and sorcery spells with mana value X or less from among them without paying their mana costs. Then put all cards exiled this way that weren't cast into your graveyard."
Collected Conjuring78%
$0.32↑#202150.53↑7.2 years↓
"Exile the top six cards of your library. You may cast up to two sorcery spells with mana value 3 or less from among them without paying their mana costs. Put the exiled cards not cast this way on the bottom of your library in a random order."
Mind's Desire76%
$0.77↑#3616↑0.74↑23.3 years↑
"Shuffle your library. Then exile the top card of your library. Until end of turn, you may play that card without paying its mana cost."
Muse Vortex76%
$0.28↑#17105↑0.41↑5.4 years↓
"Exile the top X cards of your library. You may cast an instant or sorcery spell with mana value X or less from among them without paying its mana cost. Then put the exiled instant and sorcery cards that weren't cast this way into your hand and the rest on the bottom of your library in a random order."
Dream Harvest76%
$0.38↑#6462↑0.00↓0.6 years↓
"Each opponent exiles cards from the top of their library until they have exiled cards with total mana value 5 or greater this way. Until end of turn, you may cast cards exiled this way without paying their mana costs."
Into the Time Vortex76%
$0.26#5318↑0.35↑2.9 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Vault 112: Sadistic Simulation75%
$0.22↓#11313↑0.322.5 years↓
"Pay any amount of 
. If you paid one or more this way, shuffle your library, then exile that many cards from the top. You may play one of those cards without paying its mana cost."
. If you paid one or more this way, shuffle your library, then exile that many cards from the top. You may play one of those cards without paying its mana cost."
Shardless Agent74%
$0.34↑#7378↑0.00↓14.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Bloodbraid Elf74%
$0.15↓#4839↑0.3217.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Annoyed Altisaur74%
$0.20↓#3970↑0.215.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Enlisted Wurm74%
$0.11↓#18817↑0.44↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Maelstrom Colossus74%
$0.34↑#4503↑0.38↑5.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Boarding Party74%
$0.25↓#7817↑0.00↓5.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."