Mezzio Mugger 

Creature — Lizard Rogue
$0.33 #12858 0.07 4.4 years
Whenever this creature attacks, exile the top card of each player's library. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells.
Blitz 
(If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)
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Cards similar to Mezzio Mugger 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.
Etali, Primal Storm92%
$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 Strategy91%
$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."
Nathan Drake, Treasure Hunter90%
$4.82↑#147110.000.9 years↓
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Triple Triad87%
$0.37↑#4995↑0.50↑1.2 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."
Mindleecher86%
$0.42↑#10096↑0.44↑6.4 years↑
"Whenever this creature mutates, exile the top card of each opponent's library face down. You may look at and play those cards for as long as they remain exiled."
Brainstealer Dragon85%
$8.42↑#2207↑0.48↑4.2 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."
Mayhem Patrol85%
$0.21↓#18820↓0.42↑4.4 years
"Blitz 
If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step."
Cunning Rhetoric84%
$2.19↑#2624↑0.36↑5.4 years↑
"Whenever an opponent attacks you and/or one or more planeswalkers you control, exile the top card of that player's library. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast it."
Plasma Jockey84%
$0.12↓#22331↓0.004.4 years
"Blitz 
If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step."
Pugnacious Pugilist84%
$0.11↓#19451↓0.004.4 years
"Blitz 
If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step."
Knacksaw Clique84%
$3.35↑#17338↓0.20↑18.3 years↑
"
,
: Target opponent exiles the top card of their library. Until end of turn, you may play that card."
Caldaia Strongarm84%
$0.03↓#23481↓0.27↑4.4 years
"Blitz 
If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step."
Ornate Kanzashi83%
$0.34↑#26616↓0.0521.6 years↑
"
,
: Target opponent exiles the top card of their library. You may play that card this turn."
You Find Some Prisoners82%
$0.18↓#4434↑0.21↑5.1 years
"• Interrogate Them — Exile the top three cards of target opponent's library. Choose one of them. Until the end of your next turn, you may play that card, and you may spend mana as though it were mana of any color to cast it."
Outrageous Robbery82%
$0.38↑#4711↑0.40↑2.6 years↓
"Target opponent exiles the top X cards of their library face down. You may look at and 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 type to cast it."
Fire Lord Ozai81%
$1.02↑#10036↑0.000.8 years↓
"
: Exile the top card of each opponent's library. Until end of turn, you may play one of those cards without paying its mana cost."
Uvilda, Dean of Perfection // Nassari, Dean of Expression81%
$0.28↓#16667↓0.46↑5.4 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."
Mind's Dilation80%
$0.40↑#2656↑0.76↑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."
Ixhel, Scion of Atraxa80%
$0.52↑#5800↑0.59↑3.6 years
"At the beginning of your end step, each opponent who has three or more poison counters exiles the top card of their library face down. You may look at and play those cards for as long as they remain exiled, and you may spend mana as though it were mana of any color to cast those spells."