Anzrag, the Quake-Mole

• WWizards of the Coast2024-02-02
  Official Ruling
  If multiple creatures block Anzrag, the Quake-Mole, its first ability still triggers only once.
• WWizards of the Coast2024-02-02
  Official Ruling
  If you activate Anzrag, the Quake-Mole's last ability, but each creature the defending player controls can't block for any reason, Anzrag isn't blocked. If there's a cost associated with blocking Anzrag, the defending player isn't forced to pay that cost, so it doesn't have to be blocked in that case either.
• WWizards of the Coast2024-02-02
  Official Ruling
  If you activate Anzrag, the Quake-Mole's last ability, only one creature is required to block it each combat this turn. Other creatures may also block it and are free to block other creatures or not block at all.
• WWizards of the Coast2024-02-02
  Official Ruling
  Anzrag, the Quake-Mole's first ability may trigger multiple times in the same turn. Each time it resolves, you create an additional combat phase.

Rulings via Scryfall