Valve has teased a Dota 2 card game called Artifact at day two of The International Dota 2 Championships.

Details are light on the ground, but we do know Artifact involves three boards and a selection of characters from Dota 2, and that former Double Fine lead Brad Muir has been heading up its development.

Muir previously led development on solid tactical RPG Massive Chalice and entertaining mech-powered tower defence title Iron Brigade.

A vague description of Artifact from The International host Sean “Day9” Plott suggested that the one-on-one digital card-battling game involves building barracks and creeps, and that it features lanes.

Artifact is slated for a 2018 release.

The digital card games market is a lucrative one; it is predicted to hit US$1.4 billion this year, with Hearthstone alone earning as much as US$40 million per month.