Hearthhull's second ability doesn't allow you to play lands on other players' turns
There are spells that deal with two or more things at once, there are spells that provide you will ongoing resources like Bitterblossom, and obviously the planeswalker type
, , Exert Hope Tender: Untap two target lands
If you do end up going second, Indeedees Expert Nurturer attack can help you evolve into Quaxwell or Arctibax as needed
In Legacy, Death and Taxes decks running Yorion, Sky Nomad as a Companion may have enough room to run this card too
This might have been another reason to ban Emrakul, the Promised End in Standard, with both two or three card types in your graveyard and three or four artifacts in play, including Clue tokens, the Statuary itself, Servos and more, you could get an Emrakul for 5 or 6 mana