If one of the tokens can't attack for any reason (such as being tapped), then it doesn't attack
"Post is helping us celebrate 30 years of Magic, and that includes this Secret Lair," said Mark Heggen, a product architect for Magic: The Gathering
The lack of text makes it look simple, but this is actually a board wipe, a Mill tool, and a mass Burn spell all in one
Another possible result of the roll is the Planeswalker symbol, in which case the player who rolled the die puts the active plane on the bottom of its owner's or the shared planar deck and reveals the first card of their own planar deck or the next plane card from the shared deck
List of Companion cards in Ikoria What are Companion cards
However, there are better cards that offer similar effects more efficiently, such as Bitterblossom or Gideon, Ally of Zendikar, which can provide a more immediate impact on the game