Act on Impulse 

Sorcery
Exile the top three cards of your library. Until end of turn, you may play those cards. (If you cast a spell this way, you still pay its costs. You can play a land this way only if you have an available land play remaining.)
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Cards that do something similar expected a card that isn't here?
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The Legend of Roku // Avatar Roku 100%
$10.50#4422
"Exile the top three cards of your library. Until the end of your next turn, you may play those cards."
Inspired Tinkering 100%
$1.33#2795
"Exile the top three cards of your library. Until the end of your next turn, you may play those cards."
Chaos Channeler 100%
$0.15#6479
"Exile the top three cards of your library. You may play them this turn."
Ecstatic Beauty 99%
$0.30#10633
"Exile the top three cards of your library. You may play those cards until end of turn. Put four time counters on each of those cards that has suspend."
Wrenn's Resolve 98%
$2.55#2117
"Exile the top two cards of your library. Until the end of your next turn, you may play those cards."
Embrace the Unknown 98%
$1.81#6416
"Exile the top two cards of your library. Until the end of your next turn, you may play those cards."
Light Up the Stage 98%
$0.28#1211
"Exile the top two cards of your library. Until the end of your next turn, you may play those cards."
Reckless Impulse 98%
$1.43#2119
"Exile the top two cards of your library. Until the end of your next turn, you may play those cards."
Questing Druid // Seek the Beast 98%
$0.40#8285
"Exile the top two cards of your library. Until your next end step, you may play those cards."
Rob the Archives 98%
$0.30#8827
"Exile the top two cards of your library. You may play those cards this turn."
Ignite the Future 98%
$0.44#3391
"Exile the top three cards of your library. Until the end of your next turn, you may play those cards. If this spell was cast from a graveyard, you may play cards this way without paying their mana costs."
Riverwheel Sweep 97%
$0.14#20488
"Exile the top two cards of your library. Choose one of them. Until the end of your next turn, you may play that card."
Crossover Collaboration 97%
$0.35#23680
"Exile the top two cards of your library. Until the end of your next turn, you may play those cards. If this spell was cast using teamwork, create a Treasure token."
Burning Curiosity 94%
$0.20#9535
"Exile the top two cards of your library. If this spell's additional cost was paid, exile the top three cards instead. Until the end of your next turn, you may play those cards."
Monastery Raid 92%
$0.20#15347
"Exile the top two cards of your library. If this spell's freerunning cost was paid, exile the top X cards of your library instead. You may play the exiled cards until the end of your next turn."
Apex of Power 88%
$1.04#4002
"Exile the top seven cards of your library. Until end of turn, you may cast spells from among them."
Glimpse the Impossible 88%
$0.29#2155
"Exile the top three cards of your library. You may play those cards this turn. At the beginning of the next end step, if any of those cards remain exiled, put them into your graveyard, then create a 0/1 colorless Eldrazi Spawn creature token for each card put into your graveyard this way. Those tokens have "Sacrifice this token: Add {C}.""
Aminatou's Augury 85%
$0.36#2541
"Exile the top eight cards of your library. You may put a land card from among them onto the battlefield. Until end of turn, for each nonland card type, you may cast a spell of that type from among the exiled cards without paying its mana cost."
Showdown of the Skalds 84%
$0.36#7632
"Exile the top four cards of your library. Until the end of your next turn, you may play those cards."