At this year’s International Dota 2 Championships, developer Valve Software announced a new game coming soon: Artifact.

Artifact is a card game based on Dota 2 involving three boards and a selection of characters from Valve’s flagship game, though other details remain light. The game was announced just before the final match of Day 2 of TI7 by event host Sean “Day9” Plott, who gave a vague description of the game that seemed to indicate it would involve building barracks, creeps, and lanes (after suggesting the announcement was not related to Dota 2). Comparisons to Blizzard’s Hearthstone seem inevitable.

The 2017 International Dota 2 Championships continue through this week. There is no announced release date for Artifact other than some time in 2018, though its Twitter account is now live.