Portal to Phyrexia is a mythic Artifact card from The Brothers' War Promos (PBRO), collector number 240p. Current market price: $49.87 (foil $49.67), TCGplayer market prices via Scryfall.
When this artifact enters, each opponent sacrifices three creatures of their choice. At the beginning of your upkeep, put target creature card from a graveyard onto the battlefield under your control. It's a Phyrexian in addition to its other types.