Diamond City is a rare Land card from Fallout (PIP), collector number 147. Current market price: $2.92 (foil $5.52), TCGplayer market prices via Scryfall.
This land enters with a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) {T}: Add {C}. {T}: Move a shield counter from this land onto target creature. Activate only if two or more creatures entered the battlefield under your control this turn.