Ashaya, Soul of the Wild

• WWizards of the Coast2020-09-25
  Official Ruling
  As long as Ashaya is on the battlefield, it's affected by its second ability and thus its first ability counts itself.
• WWizards of the Coast2020-09-25
  Official Ruling
  Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Ashaya may become lethal if lands you control leave the battlefield during that turn.
• WWizards of the Coast2020-09-25
  Official Ruling
  A land that's a Forest has the intrinsic mana ability ": Add ."
• WWizards of the Coast2020-09-25
  Official Ruling
  The ability that defines Ashaya's power and toughness applies in all zones, not just the battlefield.
• WWizards of the Coast2020-09-25
  Official Ruling
  You can't play creature cards as lands; you'll still have to cast them as spells, and they'll enter the battlefield as lands (in addition to their other types).

Rulings via Scryfall