Valve, developers of Half-Life, Team Fortress 2, Left 4 Dead, and Dota 2, have announced that they will be releasing a collectible card game based on Dota.
The game is entitled Artifact: The Dota Card Game and the announcement trailer can be seen here:
The game will be released during 2018. Also confirmed is Brad Muir, formerly of Double Fine, is working on the title:
I've been working on @PlayArtifact at Valve for a while now! Can't wait for you guys to play it! :D!
— Brad Muir (@MrMooEar) August 9, 2017