Like control decks, midrange decks will gain incremental advantages over the course of the game, but where they differ is that midrange apply pressure to the opponent at all stages of the game, not just towards the end
That said, unless you have town synergies, you dont need to pick Capital City highly, though its likely better than most mediocre commons
Once your gameplan gets going, it can snowball, but getting there can be a struggle if you get targeted before you start animating permanents
Boros Reckoner, Stuffy Doll, Repercussion (careful with that one), Spiteful Sliver, Wrathful Red Dragon, Pariah, Pariahs Shield, as well as Dictate of the Twin Gods and other backup doubling effects
You can just run him out and have him be fine but ideally the plan is to hold him back and use him to toss one of the massive dorks at face