Rise of the Triad had Steam trading card support added on July 14, 2013. There are 9 cards in the series, 5 of which you'll receive for purchasing and playing the game.
Trading Cards
Ian Paul "IP" Freely
Sebastian 'Doyle' Krist
Foil Cards
Ian Paul "IP" Freely
Badges
Level 1
Initiate
Initiate
Level 2
Low Guard
Low Guard
Level 3
High Guard
High Guard
Level 4
Overpatrol
Overpatrol
Level 5
Enforcer
Enforcer
Foil Badge
Hand of Oscuro
Hand of Oscuro
Booster Packs
Booster Pack
Emoticons
:Koin:
(common)
(common)
:Porridge:
(common)
(common)
:Ankh:
(uncommon)
(uncommon)
:Gib:
(uncommon)
(uncommon)
:Triad:
(rare)
(rare)
Profile Backgrounds
Split Missile
(common)
(common)
Firebomb
(uncommon)
(uncommon)
Flamewall
(uncommon)
(uncommon)
Dark Staff
(rare)
(rare)
Excalibat
(rare)
(rare)