Garry's Mod is a game that had cards added on July 12, 2013. It has 9 cards, 5 of which are available from purchasing and playing the game.
Trading Cards
Foil Trading Cards
Face Posing (Foil)
Physgun (Foil)
Thrusters (Foil)
Movie Maker (Foil)
Spammer (Foil)
Melon Racer (Foil)
Missing Textures (Foil)
Trouble In Terrorist Town (Foil)
Badges
Level 1
Spammer
Spammer
Level 2
Crasher
Crasher
Level 3
Spawner
Spawner
Level 4
Builder
Builder
Level 5
Modder
Modder
Foil Badge
Creator
Creator
Emoticons
:gmod:
(common)
(common)
:balloon:
(common)
(common)
:facepunch:
(uncommon)
(uncommon)
:melon:
(uncommon)
(uncommon)
:physgun:
(uncommon)
(uncommon)
:box:
(rare)
(rare)
:missing:
(rare)
(rare)
Profile Backgrounds
GM_Construct
(common)
(common)
Derp
(uncommon)
(uncommon)
Movie Creator
(uncommon)
(uncommon)
Rocket Man
(rare)
(rare)
Trouble in Terrorist Town
(rare)
(rare)