Throne of Eldraine is a rare Legendary Artifact card from The List (PLST), collector number WOC-28. Current market price: $29.41, TCGplayer market prices via Scryfall.
As Throne of Eldraine enters, choose a color. {T}: Add four mana of the chosen color. Spend this mana only to cast monocolored spells of that color. {3}, {T}: Draw two cards. Spend only mana of the chosen color to activate this ability.