Kylox, Visionary Inventor (Showcase) (MKM-365) - Murders at Karlov Manor: (Showcase) Foil

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.