Valve is the company behind Steam and the Steam Deck, they are the developer and publisher of their own video games that have Steam trading cards that utilise Source and Source 2, their own video game engines:
- Counter-Strike: Global Offensive (Counter-Strike 2)
- Day of Defeat: Source
- Dota 2
- Garry's Mod (published on behalf of Facepunch Studios)
- Half-Life 2
- Left 4 Dead 2
- Portal 2
- Team Fortress 2
Two of Valve's latest video games come with cosmetics but have no trading cards:
- Aperture Desk Job
- Half-Life: Alyx
A documentary was also released by Valve with trading card support (although it is currently impossible to receive the cards):