Petrified Hamlet is a rare Land card from Secrets of Strixhaven Promos (PSOS), collector number 259p. Current market price: $1.10 (foil $3.06), TCGplayer market prices via Scryfall.
When this land enters, choose a land card name. Activated abilities of sources with the chosen name can't be activated unless they're mana abilities. Lands with the chosen name have "{T}: Add {C}." {T}: Add {C}.