Kylox, Visionary Inventor 
Legendary Creature — Lizard Artificer
$0.14 #17949 0.20 2.6 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?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Felix Five-Boots78%
$4.28↑#4860↑0.212.4 years
"Menace, ward "
"
Nashi, Moon's Legacy76%
$0.28↑#186480.243.3 years
"Menace, ward 
"
"
Brawl-Bash Ogre75%
$0.12↓#29829↓0.228.1 years↑
"Menace"
Goblin Dark-Dwellers74%
$0.26↑#8945↑0.00↓10.6 years↑
"Menace"
+1 more matching line
Dreadhorde Arcanist73%
$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."
Diviner of Mist73%
$0.28↑#8659↑0.211.4 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."
Goliath Daydreamer72%
$0.28↑#9800↑0.00↓0.6 years↓
"Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost."
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."
Minion of the Mighty71%
$0.38↑#6266↑0.69↑5.1 years↑
"Menace"
The Infamous Cruelclaw71%
$1.38↑#5153↑0.71↑2.1 years
"Menace"
+1 more matching line
Jeleva, Nephalia's Scourge70%
$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."
Cosmic Cube70%
$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 Sinclair70%
$0.27↑#12645↑0.09↓2.9 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."
Mosswort Bridge70%
$0.31↑#197↑0.1718.9 years↑
"
, 
: You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater."
, : You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater."