Autodraw
The Far Wilds tries to make sure you are always able to increase your domain level. It does this by sometimes changing the next card you would draw.
1) When he game is started, any default base building in your Army is added to a list of External Cards. (Any Grove, Graveyard etc)
2) If you don't have a Base in play, or in your hand you will draw the first available one from your Army if you have the domain for it.
3) If you have a card in hand that you don't have the domain for and you don't have a card that gives you that domain in hand that you can play you will draw a card from your army that gives you that domain if you have one. If there isn't a card in your Army then you will draw one from your External Card list.
This means that if you start with one Grove in your Army and later it is destroyed. You will keep drawing Groves as long as you need them.