Door to Nothingness is a rare Artifact card from The Brothers' War Retro Artifacts (BRR), collector number 77. Current market price: $0.42 (foil $0.53), 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.