Thran Portal is a rare Land — Gate card from Dominaria United Promos (PDMU), collector number 259p. Current market price: $1.48 (foil $0.92), TCGplayer market prices via Scryfall.
This land enters tapped unless you control two or fewer other lands. As this land enters, choose a basic land type. This land is the chosen type in addition to its other types. Mana abilities of this land cost an additional 1 life to activate.