From the publisher website:
This is a supplemental deck for Masks: A New Generation. The Deck of Villainy includes 54 unique villains with their own portraits, names, drives, powers, moves, conditions, and descriptions! It has everything a GM needs to populate Halcyon City with a slew of dangerous, dastardly, and devilish villains!
Also included is a summary card with the rules for creating your own villains, so you can quickly and easily generate your own addition to this rogue’s gallery on the fly.