Pit Automaton

• WOTC Official Reminder Textofficial rules
  Defender — This creature can't attack.

• WWizards of the Coast2025-02-07
  Official Ruling
  Pit Automaton has received an update to its Oracle text. Specifically, the delayed triggered ability doesn’t trigger if you activate an exhaust ability that is also a mana ability.
• WWizards of the Coast2025-02-07
  Official Ruling
  If an ability triggers whenever you activate an exhaust ability, that ability resolves before the exhaust ability resolves.
• WWizards of the Coast2025-02-07
  Official Ruling
  If an exhaust ability of a permanent is activated, and then that permanent leaves the battlefield and returns to the battlefield, it becomes a new object so its exhaust ability can be activated again.
• WWizards of the Coast2025-02-07
  Official Ruling
  Exhaust abilities can be activated any time you could normally activate an ability.

Rulings via Scryfall