Xi Cards

Xi Cards is a collectible card game in which players command one of four factions and two ancient powers, competing to determine the fate of a planet. The game has a BoardGameGeek entry confirming its existence as a CCG, but the publisher, country of origin, and publication date remain unconfirmed in any accessible public source. No rule documentation, card scans, or commercial listings have surfaced in the public record. With four distinct factions as the core structural element, the design appears to follow a faction-battle model common to fantasy CCGs of the 2000s and 2010s, but details of mechanics and set history are absent. Xi Cards is held in the uncharted archive because its obscurity is nearly total.

Source: boardgamegeek.com/boardgame/148432/xi-cards