Epic Experiment 
Sorcery
$0.24 #6343 0.48 14.0 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.
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Collected Conjuring92%
$0.28↑#20559↓0.06↓7.4 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."
Muse Vortex91%
$0.29↑#17406↓0.445.5 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."
Discover the Impossible87%
$0.22↓#18651↓0.00↓4.7 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."
Portent of Calamity86%
$0.30↑#10158↓0.17↓2.2 years↓
"Reveal the top X cards of your library. For each card type, you may exile a card of that type from among them. Put the rest into your graveyard. You may cast a spell from among the exiled cards without paying its mana cost if you exiled four or more cards this way. Then put the rest of the exiled cards into your hand."
Chandra, Pyromaster79%
$0.49↑#13132↓0.00↓13.3 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."
Hazoret's Undying Fury79%
$0.25↑#24490↓0.18↓9.3 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."
Diviner of Mist76%
$0.23↓#8652↓0.14↓1.5 years↓
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Kylox, Visionary Inventor76%
$0.15↓#18329↓0.10↓2.7 years↓
"Whenever this card attacks, sacrifice any number of other creatures, then exile the top X cards of your library, where X is their total power. You may cast any number of instant and/or sorcery spells from among the exiled cards without paying their mana costs."
Storm of Memories75%
$0.37↑#13555↓0.450.9 years↓
"Exile an instant or sorcery card with mana value 3 or less from your graveyard at random. You may cast it without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Daring Waverider75%
$0.20↓#9187↓0.32↓2.2 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Goblin Dark-Dwellers74%
$0.26↑#8983↓0.27↓10.7 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Invoke Calamity73%
$0.41↑#4100↑0.404.7 years↓
"You may cast up to two instant and/or sorcery spells with total mana value 6 or less from your graveyard and/or hand without paying their mana costs. If those spells would be put into your graveyard, exile them instead. Exile this card."
Sins of the Past73%
$0.46↑#22839↓0.06↓21.0 years↑
"Until end of turn, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Exile this card."
Talent of the Telepath72%
$0.65↑#10458↓0.31↓11.3 years↓
"Target opponent reveals the top seven cards of their library. You may cast an instant or sorcery spell from among them without paying its mana cost. Then that player puts the rest into their graveyard."
Summons of Saruman72%
$0.38↑#56010.61↑3.3 years↓
"Amass Orcs X. Mill X cards. You may cast an instant or sorcery spell with mana value X or less from among them without paying its mana cost."
Zaffai and the Tempests72%
$0.21↓#12086↓0.26↓0.5 years↓
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Galvanoth71%
$0.31↑#13144↓0.12↓15.7 years↑
"At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell."
Dance with Calamity70%
$0.30↑#4191↑0.28↓3.5 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."
Founding the Third Path70%
$0.26↑#14205↓0.12↓4.1 years↓
"You may cast an instant or sorcery spell with mana value 1 or 2 from your hand without paying its mana cost."
Lady Loki, Agent of Chaos70%
$0.26↑#16576↓0.20↓0.3 years↓
"Whenever you cast your first instant, sorcery, or Villain spell each turn, exile it, then exile cards from the top of your library until you exile a nonland card. this card deals damage to each opponent equal to the difference between that spell's mana value and that nonland card's mana value. You may cast that card without paying its mana cost."