Discover the Impossible 
Instant
$0.19 #18389 0.06 4.5 years
Look at the top five cards of your library. Exile one of them face down and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost if it's an instant spell with mana value 2 or less. If you don't, put that card into your hand.
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Cards similar to Discover the Impossible expected a card that isn't here?
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Collected Conjuring92%
$0.32↑#202150.53↑7.2 years↑
"Exile the top six cards of your library. You may cast up to two sorcery spells with mana value 3 or less from among them without paying their mana costs. Put the exiled cards not cast this way on the bottom of your library in a random order."
Muse Vortex90%
$0.28↑#171050.41↑5.4 years
"Exile the top X cards of your library. You may cast an instant or sorcery spell with mana value X or less from among them without paying its mana cost. Then put the exiled instant and sorcery cards that weren't cast this way into your hand and the rest on the bottom of your library in a random order."
Epic Experiment87%
$0.28↑#6185↑0.42↑13.9 years↑
"Exile the top X cards of your library. You may cast instant and sorcery spells with mana value X or less from among them without paying their mana costs. Then put all cards exiled this way that weren't cast into your graveyard."
Portent of Calamity84%
$0.28↑#9795↑0.48↑2.1 years↓
"Reveal the top X cards of your library. For each card type, you may exile a card of that type from among them. Put the rest into your graveyard. You may cast a spell from among the exiled cards without paying its mana cost if you exiled four or more cards this way. Then put the rest of the exiled cards into your hand."
Hazoret's Undying Fury80%
$0.26↑#24004↓0.23↑9.1 years↑
"Shuffle your library, then exile the top four cards. You may cast any number of spells with mana value 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step."
Glorious Purpose79%
$0.29↑#11511↑0.000.2 years↓
"When the sixth plan counter is put on this enchantment, sacrifice it. If you do, exile the top four cards of your library. You may cast any number of spells from among them without paying their mana costs. Put the rest into your hand."
Sunbird's Invocation77%
$0.25↑#1885↑0.32↑8.9 years↑
"Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order."
The Key to the Vault77%
$0.37↑#2165↑0.23↑2.4 years↓
"Whenever equipped creature deals combat damage to a player, look at that many cards from the top of your library. You may exile a nonland card from among them. Put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost."
Herald of Amity76%
$0.25↑#10956↑0.000.4 years↓
"When this creature enters, exile the top eight cards of your library. You may cast an Aura spell from among them without paying its mana cost. Then put the rest on the bottom of your library in a random order."
Svella, Ice Shaper74%
$0.16↓#6962↑0.25↑5.6 years↑
"
, 
: Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
, : Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Solstice Revelations74%
$0.20↑#7153↑0.000.8 years↓
"Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost if the spell's mana value is less than the number of Mountains you control. If you don't cast that card this way, put it into your hand."
Aetherworks Marvel74%
$0.30↑#3523↑0.55↑9.9 years↑
", Pay six 
: Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
, Pay six : Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Perception Bobblehead74%
$2.12↑#5954↑0.062.5 years↓
"
, : Look at the top X cards of your library, where X is the number of Bobbleheads you control. You may cast a spell with mana value 3 or less from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
, : Look at the top X cards of your library, where X is the number of Bobbleheads you control. You may cast a spell with mana value 3 or less from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Keldon Flamesage72%
$0.17↓#184330.134.0 years
"Whenever this creature attacks, look at the top X cards of your library, where X is this creature's power. You may exile an instant or sorcery card with mana value X or less from among them. Put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost."
Improvisation Capstone70%
$10.94↑#2932↑0.000.4 years↓
"Exile cards from the top of your library until you exile cards with total mana value 4 or greater. You may cast any number of spells from among them without paying their mana costs."
Dance with Calamity70%
$0.29↑#4272↑0.50↑3.4 years↓
"Shuffle your library. As many times as you choose, you may exile the top card of your library. If the total mana value of the cards exiled this way is 13 or less, you may cast any number of spells from among those cards without paying their mana costs."