Retrovirus had cards added on 22 July 2013. There are 8 cards in the series, and you'll receive 4 cards at random for purchasing and playing the game.
Trading Cards[]
Foil Cards[]
Badges[]
Booster Pack[]
Emoticons[]
:LoaderCovering
Face:
(common)
:InfectedObserver:
(uncommon)
Profile Backgrounds[]
Retrovirus Shield
(common)
Card Artwork[]