Arbiter of the Ideal

• WWizards of the Coast2014-02-01
  Official Ruling
  If an inspired ability triggers during your untap step, the ability will be put on the stack at the beginning of your upkeep. If the ability creates one or more token creatures, those creatures won’t be able to attack that turn (unless they gain haste).
• WWizards of the Coast2014-02-01
  Official Ruling
  The permanent will be an enchantment as it enters the battlefield and will cause constellation abilities of permanents you control to trigger.
• WWizards of the Coast2014-02-01
  Official Ruling
  Inspired abilities don’t trigger when the creature enters the battlefield.
• WWizards of the Coast2014-02-01
  Official Ruling
  If the inspired ability includes an optional cost, you decide whether to pay that cost as the ability resolves. You can do this even if the creature leaves the battlefield in response to the ability.
• WWizards of the Coast2014-02-01
  Official Ruling
  If you choose to not put the card onto the battlefield, or if the card isn’t one of the listed types, it will remain on top of your library. (Note that revealing the card is not optional.)
• WWizards of the Coast2014-02-01
  Official Ruling
  The manifestation counter is a memory aid only. The permanent will continue to be an enchantment in addition to its other types even if that counter is removed.
• WWizards of the Coast2014-02-01
  Official Ruling
  Inspired abilities trigger no matter how the creature becomes untapped: by the turn-based action at the beginning of the untap step or by a spell or ability.

Rulings via Scryfall