Secluded Starforge is a rare Land card from Edge of Eternities Promos (PEOE), collector number 257p. Current market price: $0.40 (foil $0.84), TCGplayer market prices via Scryfall.
{T}: Add {C}. {2}, {T}, Tap X untapped artifacts you control: Target creature gets +X/+0 until end of turn. Activate only as a sorcery. {5}, {T}: Create a 2/2 colorless Robot artifact creature token.