Is two main deck really necessary? Seeing as how they'd be replacing the Naturalizes, what would you put in the sideboard to fill the slots?
They aren't nessessarily replacing Naturalizes. They basically are Naturalizes 3 and 4 for me. I also think 2 main is fine. I mean, it basically means I'm running 2 Uktabi Orangutan and 2 Elvish Lyrist in the maindeck. But I'm considering maybe keeping in Uktabi Orangutan and just dropping Elvish Lyrist for it, because Uktabi has great synergy with Tradewind Rider, which is somewhat important in the Welder Mud matchup(if you're able to pull it off, which you should be able to.)