Seal from Existence

• 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 Coast2023-04-14
  Official Ruling
  Seal from Existence’s last ability creates two one-shot effects: one that exiles the permanent when the ability resolves, and another that returns the exiled card to the battlefield immediately after Seal from Existence leaves the battlefield.
• WWizards of the Coast2023-04-14
  Official Ruling
  Auras attached to the exiled permanent will be put into their owners’ graveyards. Equipment attached to an exiled creature will become unattached and remain on the battlefield. Any counters on the exiled permanent will cease to exist.
• WWizards of the Coast2023-04-14
  Official Ruling
  In a multiplayer game, if Seal from Existence’s owner leaves the game, the exiled card will return to the battlefield. Because the one-shot effect that returns the card isn’t an ability that goes on the stack, it won’t cease to exist along with the leaving player’s spells and abilities on the stack.
• WWizards of the Coast2023-04-14
  Official Ruling
  If a token is exiled, it ceases to exist. It won’t be returned to the battlefield.
• WWizards of the Coast2023-04-14
  Official Ruling
  If Seal from Existence leaves the battlefield before its last ability resolves, the target permanent won’t be exiled.

Rulings via Scryfall