Door to Nothingness is a rare Artifact card from Secret Lair Drop (SLD), collector number 1678. Current market price: $13.55 (foil $15.03), TCGplayer market prices via Scryfall.
This artifact enters tapped. {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}, {T}, Sacrifice this artifact: Target player loses the game.