Long River Lurker

• WOTC Official Reminder Textofficial rules
  Ward — Whenever this permanent becomes the target of a spell or ability an opponent controls, counter it unless that player pays [cost].

• WWizards of the Coast2024-07-26
  Official Ruling
  If a token is exiled this way, it will cease to exist and won't return to the battlefield.
• WWizards of the Coast2024-07-26
  Official Ruling
  Once the exiled permanent returns, it's considered a new object with no relation to the object that it was. Auras attached to the exiled permanent will be put into their owners' graveyards. Equipment attached to the exiled permanent will become unattached and remain on the battlefield. Any counters on the exiled permanent will cease to exist.
• WWizards of the Coast2024-07-26
  Official Ruling
  Once a ward ability of another Frog has triggered, causing it to lose ward by removing Long River Lurker or changing its creature types won't affect that ability. The appropriate player will still have to pay or have their spell or ability countered.

Rulings via Scryfall