Many things in this piece come together
Each Assassin token can enter attacking a different player, planeswalker, or battle, and they don't need to be the same ones that the Assassins you control are attacking
Is this a sign that alternate win conditions in Commander are on the way out, or will WotC balance the draw-out-your-library wincon cards in the future
But in aggregate, high-damage-rate creatures like Jackal Pup and Goblin Guide will tend to speed up the format, which gives high-MV cards more risk in the metagame, which decreases the number of viable high-MV cards in that format, which increases power level
Whirlwind Denial Whirlwind Denial has the same advantages of a Flusterstorm, in that its looking to counter a ton of effects on the stack all at once