Kylox, Visionary Inventor
Menace, ward 
, haste
Whenever 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.
Illustrated by Lie Setiawan
This printing
Prices
If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
Use the power of the sacrificed creatures as they last existed on the battlefield to determine the value of X.
You choose which spells to cast (if any) as Kylox, Visionary Inventor's last ability resolves. If you choose to cast any spells, you do so as part of the resolution of that ability. You can't wait to cast them later in the turn. Timing restrictions based on the cards' types are ignored.
If the spell you cast has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
