Gnoll War Band

• WOTC Official Reminder Textofficial rules
  Menace — This creature can't be blocked except by two or more creatures.

• WWizards of the Coast2022-06-10
  Official Ruling
  The term “defending player” in the myriad rules (or any other ability of an attacking creature) refers to the player the creature with myriad was attacking or the controller of the planeswalker it was attacking at the time the ability resolves. If that creature is no longer attacking, it refers to the player it was last attacking or the controller of the planeswalker it was last attacking.
• WWizards of the Coast2022-06-10
  Official Ruling
  You choose whether each token is attacking the player or a planeswalker they control as the token is created. If it’s attacking a planeswalker, you choose which one.
• WWizards of the Coast2022-06-10
  Official Ruling
  The tokens all enter the battlefield at the same time.
• WWizards of the Coast2022-06-10
  Official Ruling
  Each token copies exactly what was printed on the original creature and nothing else. It doesn’t copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.
• WWizards of the Coast2022-06-10
  Official Ruling
  Opponents who have left the game will not be counted when determining how many opponents have been dealt damage this turn.
• WWizards of the Coast2022-06-10
  Official Ruling
  Although the tokens enter the battlefield attacking, they were never declared as attackers. Abilities that trigger whenever a creature attacks won’t trigger, including the myriad ability of the tokens. If there are any costs to have a creature attack, those costs won’t apply to the tokens.
• WWizards of the Coast2022-06-10
  Official Ruling
  If the defending player is your only opponent, no tokens are put onto the battlefield.
• WWizards of the Coast2022-06-10
  Official Ruling
  If myriad creates more than one token for any given player (due to an effect such as the one Doubling Season creates), you may choose separately for each token whether it’s attacking the player or a planeswalker they control.
• WWizards of the Coast2022-06-10
  Official Ruling
  Any enters-the-battlefield abilities of the copied creature will trigger when the tokens enter the battlefield. Any “as [this permanent] enters the battlefield” or “[this permanent] enters the battlefield with” abilities of the copied creature will also work.

Rulings via Scryfall