Phyrexia: All Will Be One showcases the fight agains the Phyrexians from the view of the antagonistic Phyrexian forces led by Elesh Norn. The Phyrexians are poised to invade the Multiverse and even corrupt a few planeswalkers along the way.
Art treatments in Phyrexia: All Will Be One include Showcase "Ichor Slick" cards and Phyrexian-ized Planeswalkers in a Manga-style, alongside the usual Borderless and Extended Art cards. Foilings in Phyrexia: All Will Be One include Traditional Foil, Step-and-Compleat Foils from Collector Boosters, and Oil Slick Foils from Compleat Edition Bundles. Step-and-Compleat Foils feature the famous Phyrexian symbol patterned across the card. Oil Slick Foils feature a dark colored card underneat the foiling. [source]