Plargg and Nassari 
Legendary Creature — Orc Efreet
$0.30 #2290 0.46 3.3 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.
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Cards similar to Plargg and Nassari 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.
Fevered Suspicion91%
$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."
Etali, Primal Conqueror // Etali, Primal Sickness87%
$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."
Ensnared by the Mara87%
$7.61↑#3385↓0.482.9 years
"Each opponent faces a villainous choice — They exile cards from the top of their library until they exile a nonland card, then you may cast that card without paying its mana cost, or that player exiles the top four cards of their library and this card deals damage equal to the total mana value of those exiled cards to that player."
Etali, Primal Storm86%
$0.44↑#266↑0.85↑8.6 years↑
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Stolen Goods86%
$0.25↓#9128↓0.92↑14.3 years↑
"Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Dream Harvest85%
$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."
Rashmi and Ragavan84%
$0.44↑#10067↓0.65↑3.4 years
"Whenever you cast your first spell during each of your turns, exile the top card of target opponent's library and create a Treasure token. Then you may cast the exiled card without paying its mana cost if it's a spell with mana value less than the number of artifacts you control. If you don't cast it this way, you may cast it this turn."
Mind's Dilation83%
$0.40↑#26560.76↑10.1 years↑
"Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost."
Villainous Wealth82%
$0.29↓#24060.63↑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."
Stolen Strategy82%
$0.34↑#4563↓0.65↑8.2 years↑
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Triple Triad78%
$0.37↑#4995↓0.501.2 years↓
"At the beginning of your upkeep, each player exiles the top card of their library. Until end of turn, you may play the card you own exiled this way and each other card exiled this way with lesser mana value than it without paying their mana costs."
Extract Power78%
$0.31↑#16410↓0.00↓0.2 years↓
"Look at the top card of each player's library, then exile those cards face down. You may play them without paying their mana costs for as long as they remain exiled."
Nicol Bolas, God-Pharaoh78%
$3.09↑#5829↓0.91↑9.1 years↑
"+2: Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Brainstealer Dragon77%
$8.42↑#22070.484.2 years
"At the beginning of your end step, exile the top card of each opponent's library. You may play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it."
Bismuth Mindrender77%
$0.36↑#7309↓0.65↑2.2 years↓
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card. You may cast that card by paying life equal to the spell's mana value rather than paying its mana cost."
Uvilda, Dean of Perfection // Nassari, Dean of Expression76%
$0.28↓#16667↓0.465.4 years↑
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Xander's Pact76%
$0.30#16584↓0.19↓4.4 years↑
"Each opponent exiles the top card of their library. You may cast spells from among those cards this turn. If you cast a spell this way, pay life equal to that spell's mana value rather than pay its mana cost."
Krang & Shredder76%
$0.35↑#12913↓0.00↓0.5 years↓
"Whenever this card enter or attack, each opponent exiles cards from the top of their library until they exile a nonland card."
Chaos Wand76%
$0.25↓#4248↓0.27↓8.1 years↑
"
, 
: Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
, : Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
Wanda's Vision76%
$4.40↑#15929↓0.00↓0.2 years↓
"Whenever you cast your second spell each turn, exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost."