Preston Garvey, Minuteman (Extended Art) (PIP-425) - Fallout: (Extended Art)

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 ': Add one mana of any color.'"
Whenever Preston Garvey attacks, untap each enchanted permanent you control.