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
(Target a(n) land as you cast this. This card enters the battlefield attached to that land.) and "Enchanted land has '

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