Greasewrench Goblin

• 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
  You may activate this creature’s exhaust ability without discarding cards if you just want to put a +1/+1 counter on it.
• WWizards of the Coast2025-02-07
  Official Ruling
  Exhaust abilities can be activated any time you could normally activate an 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.

Rulings via Scryfall