Even with all of that, youre not playing the most threat-dense deck (Spirits plays, on average, about 8 more Creatures than Rogues does) and you dont have the instant-win button that is Shacklegeist, so the matchup becomes a bit more work than youd otherwise have to do as Spirits
Like these two dorks
Then, at the beginning of our combat we get to make a free 1/1 Rat token that cannot block
It has trample, haste, and "At the beginning of the end step, sacrifice this token." At the beginning of each player's upkeep, that player creates a 5/1 red Elemental creature token named Lightning Rager
There are a few permanents that offer more doubling up of counters, as well as ones that save counters from removed creatures, but even without these, Counter Blitz is very powerful right out of the box