It floors the deck at Bracket 4 if the deck has the acceleration to deploy it
You obviously wont want to proliferate your own battles since you want to remove them as quickly as possible, but you can always proliferate your opponents battles to drag them out as much as possible
There are plenty of quality cards that synergize well with Herald of Secret Streams, and you dont have to work hard to have creatures with +1/+1 counters in this format
By sequencing with intent, and by making the most of your mana, you dont have to spend mental energy and sometimes anguish over something you cant control, which frees up time to focus on the way the game is going instead
So, let's take a stroll down memory lane and recall the time when we could go to two parties in a row and cast an Ulamog on turn four
2 in conjunction with those tournaments