Kylox, Visionary Inventor 
Legendary Creature — Lizard Artificer
$0.15 #18329 0.10 2.7 years
Menace, ward 
, haste
, hasteWhenever Kylox 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.
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Cards similar to Kylox, Visionary Inventor expected a card that isn't here?
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Felix Five-Boots76%
$4.88↑#4950↑0.132.5 years
"Menace, ward "
"
Keldon Flamesage76%
$0.14↓#187520.00↓4.1 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."
Cosmic Cube76%
$6.78↑#5281↑0.53↑0.3 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."
Epic Experiment76%
$0.24↑#6343↑0.48↑14.0 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."
Nashi, Moon's Legacy75%
$0.24↑#191190.193.4 years
"Menace, ward 
"
"
Velomachus Lorehold74%
$0.33↑#7545↑0.22↑5.5 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."
Brawl-Bash Ogre73%
$0.12↓#30029↓0.00↓8.3 years↑
"Menace"
Goblin Dark-Dwellers73%
$0.26↑#8983↑0.27↑10.7 years↑
"Menace"
+1 more matching line
Collected Conjuring72%
$0.28↑#205590.067.4 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%
$0.58↑#8077↑0.20↑7.5 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."
Diviner of Mist71%
$0.23↑#8652↑0.141.5 years↓
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Muse Vortex71%
$0.29↑#174060.44↑5.5 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."
The Infamous Cruelclaw70%
$1.52↑#5439↑0.53↑2.2 years
"Menace"
+1 more matching line
Minion of the Mighty70%
$0.24↑#6166↑0.32↑5.2 years↑
"Menace"