Guff Rewrites History 
Instant
$3.27 #4432 0.51 3.1 years
For each player, choose target nonenchantment, nonland permanent that player controls. Those permanents' owners shuffle them into their libraries. Each player who controlled one of those permanents exiles cards from the top of their library until they exile a nonland card, then puts the rest on the bottom of their library in a random order. Each player may cast the nonland card they exiled without paying its mana cost.
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Transforming Flourish78%
$0.26↓#11668↓0.15↓1.4 years↓
"Destroy target artifact or creature you don't control. If that permanent is destroyed this way, its controller exiles cards from the top of their library until they exile a nonland card, then they may cast that card without paying its mana cost."
Plargg and Nassari73%
$0.30↓#2290↑0.463.3 years
"At the beginning of your upkeep, each player exiles cards from the top of their library until they exile a nonland card. An opponent chooses a nonland card exiled this way. You may cast up to two spells from among the other cards exiled this way without paying their mana costs."
Fevered Suspicion73%
$2.24↓#5506↓0.485.1 years↑
"Each opponent exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among those nonland cards without paying their mana costs."
Chaos Mutation72%
$0.44↓#8916↓0.473.9 years
"Exile any number of target creatures controlled by different players. For each creature exiled this way, its controller reveals cards from the top of their library until they reveal a creature card, puts that card onto the battlefield, then puts the rest on the bottom of their library in a random order."
Zoyowa's Justice72%
$0.27↓#5404↓0.26↓2.8 years
"The owner of target artifact or creature with mana value 1 or greater shuffles it into their library. Then that player discovers X, where X is its mana value."
Divergent Transformations72%
$0.32↓#9198↓0.00↓9.8 years↑
"Exile two target creatures. For each of those creatures, its controller reveals cards from the top of their library until they reveal a creature card, puts that card onto the battlefield, then shuffles the rest into their library."
Unexplained Absence71%
$0.42↓#6689↓0.35↓2.6 years
"For each player, exile up to one target nonland permanent that player controls. For each permanent exiled this way, its controller cloaks the top card of their library."
Etali, Primal Conqueror // Etali, Primal Sickness70%
$25.50↑#799↑1.65↑3.4 years
"When this card enters, each player exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among the nonland cards exiled this way without paying their mana costs."
Indomitable Creativity70%
$0.47↓#10839↓0.86↑9.6 years↑
"Destroy X target artifacts and/or creatures. For each permanent destroyed this way, its controller reveals cards from the top of their library until an artifact or creature card is revealed and exiles that card. Those players put the exiled cards onto the battlefield, then shuffle."