Kylox, Visionary Inventor
{5}{U}{R}Legendary Creature — Lizard Artificer
Menace, ward {2}, 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.