Resident Evil 4 had Steam trading card support added on 27 February 2014. There are 8 cards in the series, and you'll receive 4 cards at random for purchasing and playing the game.
The game has since gotten a remake, which has its own separate set of trading cards. In addition, the other installments in the game series, Resident Evil 0, Resident Evil, Resident Evil 2, Resident Evil 3, Resident Evil 5 Resident Evil 6, Resident Evil 7 Biohazard, Resident Evil Village, Resident Evil Revelations, Resident Evil Revelations 2 and Resident Evil: Resistance also have trading card support.
Trading Cards
Foil Cards
Badges
Booster Pack
Emoticons
Profile Backgrounds