Preston Garvey, Minuteman is a mythic Legendary Creature — Human Soldier card from Fallout (PIP), collector number 425. Current market price: $0.49 (foil $0.71), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, create a green Aura enchantment token named Settlement attached to up to one target land you control. It has enchant land and "Enchanted land has '{T}: Add one mana of any color.'" Whenever Preston Garvey attacks, untap each enchanted permanent you control.