Mirko, Obsessive Theorist

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.

Multiple finality counters on a single permanent are redundant.

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.