Nekuroshi, Who Died Twice

Vigilance, lifelink, menace.
Instant cards in your hand are Arcane in addition to their other types and have splice onto arcane. Its splice onto arcane cost is equal to its mana cost reduced by {1}.
When Nekuroshi dies, if it had no counters on it, return it to the battlefield under its owner's control with a finality counter on it.
As long as Nekuroshi has a finality counter on it, it gets +2/+0 and "Once during your turn you may play a Spirit or Arcane card from your graveyard."