Keldon Flamesage 

Creature — Human Shaman
$0.17 #18433 0.13 4.0 years
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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.
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Velomachus Lorehold94%
$0.31↑#7515↑0.45↑5.4 years↑
"Whenever this card attacks, look at the top seven cards of your library. You may cast an instant or sorcery spell with mana value less than or equal to this card's power from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Muse Vortex83%
$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."
Cosmic Cube75%
$11.80↑#6240↑0.00↓0.2 years↓
"Whenever you attack, look at the top six cards of your library. You may cast a spell from among them with mana value less than or equal to the greatest power among attacking creatures you control without paying its mana cost. Put the rest on the bottom of your library in a random order."
Ryan Sinclair74%
$0.27↑#12645↑0.092.9 years↓
"Whenever Ryan attacks, exile cards from the top of your library until you exile a nonland card. You may cast the exiled card without paying its mana cost if it's a spell with mana value less than or equal to Ryan's power. Put the exiled cards not cast this way on the bottom of your library in a random order."
Collected Conjuring74%
$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."
Dreadhorde Arcanist72%
$0.39↑#7975↑0.117.3 years↑
"Whenever this creature attacks, you may cast target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Discover the Impossible72%
$0.19↑#183890.064.5 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."
Kylox, Visionary Inventor72%
$0.14↓#179490.202.6 years↓
"Whenever this card attacks, sacrifice any number of other creatures, then exile the top X cards of your library, where X is their total power. You may cast any number of instant and/or sorcery spells from among the exiled cards without paying their mana costs."
The Key to the Vault71%
$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."