They both have power which scales based on the number of instants and sorceries in your graveyard
Like other creatures that enter tapped and attacking, the tokens are never declared as attackers, so they won't trigger any "whenever a creature attacks" abilities
To keep the speedometer ticking upward, the deck leans on pingers, chip damage sources, and oddball effects that slowly nudge opponents to make it easier to reach maximum speed and unlock that doubled draw mode
If you are building on a budget, wait a few weeks after release
Im not a huge fan of Finality counters, but I suppose its better than not getting your creatures back at all
Having everyone at such low life makes everything a giant threat, meaning players who were previously on the cusp of victory can suddenly be killed by a slight breeze