Portal to Phyrexia is a mythic Artifact card from The Brothers' War (BRO), collector number 365. Current market price: $63.56 (foil $94.84), 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.