Wand of Wonder 
Artifact
$1.89 #2436 0.23 4.2 years
, 
: Roll a d20. Each opponent exiles cards from the top of their library until they exile an instant or sorcery card, then shuffles the rest into their library. You may cast up to X instant and/or sorcery spells from among cards exiled this way without paying their mana costs.1—9 | X is one.
10—19 | X is two.
20 | X is three.
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Cards similar to Wand of Wonder expected a card that isn't here?
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Chaos Wand92%
$0.25↓#4248↓0.278.1 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."
Dazzling Sphinx88%
$0.37↓#6415↓0.53↑5.4 years↑
"Whenever this creature deals combat damage to a player, that player 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 that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Gríma, Saruman's Footman87%
$1.60↓#3164↓0.36↑3.2 years↓
"Whenever this card deals combat damage to a player, that player 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 that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Strago and Relm85%
$0.25↓#9122↓0.44↑1.2 years↓
"
, : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery."
, : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery."
Fevered Suspicion77%
$2.24↑#5506↓0.48↑5.1 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."
Planeswalker's Mischief77%
$0.39↓#27528↓0.33↑25.6 years↑
"
: Target opponent reveals a card at random from their hand. If it's an instant or sorcery card, exile it. You may cast it without paying its mana cost for as long as it remains exiled. At the beginning of the next end step, if you haven't cast it, return it to its owner's hand. Activate only as a sorcery."
: Target opponent reveals a card at random from their hand. If it's an instant or sorcery card, exile it. You may cast it without paying its mana cost for as long as it remains exiled. At the beginning of the next end step, if you haven't cast it, return it to its owner's hand. Activate only as a sorcery."
Stolen Goods76%
$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."
Extract Power74%
$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."
Talent of the Telepath73%
$0.65↓#10314↓0.65↑11.1 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."
Jeleva, Nephalia's Scourge73%
$2.41↑#14185↓0.59↑12.8 years↑
"Whenever this card attacks, you may cast an instant or sorcery spell from among cards exiled with this card without paying its mana cost."
Plargg and Nassari72%
$0.30↓#22900.46↑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."
Nicol Bolas, God-Pharaoh72%
$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."
Jace's Mindseeker72%
$0.34↓#14644↓0.2113.1 years↑
"When this creature enters, target opponent mills five cards. You may cast an instant or sorcery spell from among them without paying its mana cost."
Diluvian Primordial72%
$0.26↓#3658↓0.49↑13.6 years↑
"When this creature enters, for each opponent, you may cast up to one target instant or sorcery card from that player's graveyard without paying its mana cost. If a spell cast this way would be put into a graveyard, exile it instead."
Sorcerous Squall71%
$0.80↓#8452↓0.202.8 years↓
"Target opponent mills nine cards, then you may cast an instant or sorcery spell from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Stolen Strategy70%
$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."
Dream Harvest70%
$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."
Etali, Primal Storm70%
$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."
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."
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Synthesis Pod70%
$0.23↓#15690↓0.52↑3.6 years
"
, , Exile a spell you control: Target opponent reveals cards from the top of their library until they reveal a card with mana value equal to 1 plus the exiled spell's mana value. Exile that card, then that player shuffles. You may cast that exiled card without paying its mana cost."
, , Exile a spell you control: Target opponent reveals cards from the top of their library until they reveal a card with mana value equal to 1 plus the exiled spell's mana value. Exile that card, then that player shuffles. You may cast that exiled card without paying its mana cost."