Uchbenbak, the Great Mistake

• WOTC Official Reminder Textofficial rules
  Vigilance — Attacking doesn't cause this creature to tap.
• WOTC Official Reminder Textofficial rules
  Menace — This creature can't be blocked except by two or more creatures.

• WWizards of the Coast2023-11-10
  Official Ruling
  Cards with the ability word "descend N" have abilities that care if you have at least N permanent cards in your graveyard.
• WWizards of the Coast2023-11-10
  Official Ruling
  Some descend triggered abilities include intervening "if" clauses (i.e. "if you have [four or eight] permanent cards in your graveyard" in the middle of the ability). Each of these abilities checks your graveyard at the moment it would trigger to see if it does. If you don't have the required number of permanent cards in your graveyard at that time, the ability doesn't trigger at all. If it does trigger, it will check again as it tries to resolve. If you don't have the required number of permanent cards in your graveyard at that time, the ability won't resolve and none of its effects will happen.
• WWizards of the Coast2023-11-10
  Official Ruling
  Multiple finality counters on a single permanent are redundant.
• WWizards of the Coast2023-11-10
  Official Ruling
  Finality counters work on any permanent, not only creatures. If a permanent with a finality counter on it would be put into a graveyard from the battlefield, exile it instead.
• WWizards of the Coast2023-11-10
  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 Coast2023-11-10
  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