Mirko, Obsessive Theorist

• WOTC Official Reminder Textofficial rules
  Vigilance — Attacking doesn't cause this creature to tap.

• WWizards of the Coast2024-02-02
  Official Ruling
  An ability that triggers "whenever you surveil" triggers after you're done surveilling, even if you have fewer cards in your library than the number of cards you're instructed to surveil. It even triggers if you have no cards in your library.
• WWizards of the Coast2024-02-02
  Official Ruling
  Multiple finality counters on a single permanent are redundant.
• WWizards of the Coast2024-02-02
  Official Ruling
  Finality counters work on any permanent, not only creatures. If a permanent with a finality counter on it would go to a graveyard from the battlefield, exile it instead.
• WWizards of the Coast2024-02-02
  Official Ruling
  Finality counters don't stop permanents from going to zones other than the graveyard from the battlefield. For example, if a permanent with a finality counter on it would be put into its owner's hand from the battlefield, it does so normally.
• WWizards of the Coast2024-02-02
  Official Ruling
  Finality counters aren't keyword counters, and a finality counter doesn't give any abilities to the permanent it's on. If that permanent loses its abilities and then would go to a graveyard, it will still be exiled instead.

Rulings via Scryfall