Pretty stock list, like 48 of the cards just need to be what they are.
I think Mockingbird is great, you're gonna get more artifacts to pump up Warden by just using it as a 1 drop, so that's why it's a 4 of, keeping the creature count nice and high for Knight to restock consistently. I dropped to 21 land to squeeze a 4th Mockingbird in there, I think it's justified by the wild amount of 1 mana spells, and Maps help dig to the 3rd land. Only really need the 3rd land for Imodane's, and often enough setting up for the go-wide kill takes an extra turn or two anyways. So I'm saying it, everybody running 22 land in this deck is incorrect. We're looking for 2 or 3 land in the opener, and basically never want to flood out. Stalling on 2 is usually still winnable. Also, Knight shuffles, so when you pull 2 creatures out of the 6, which is what I've maximized for, you get even better odds on finding the Imodane land and swinging out.
Split Up is really interesting in this deck as we have almost full control over tapping the team with Warden. Problem is, our opponent is swinging with some big threat holding back blockers, so we tap the team, blow up all but the big threat... not ideal. I think Witchstalker's Frenzy is the real MVP but the Standard meta is not in my wheelhouse, I'm more talking what cards work extra effectively in this particular deck. Invasion of Gobakhan is another great card, having hand disruption and board protection, and even a clock accelerator is nuts! It is a high skill card, not that this isn't a high skill game, but it introduces a lot of lines to work through whereas sometimes you just wanna jam a Rest in Peace, or hold up a counterspell. So those are my shout-outs that missed the SB. Shout out to Nurturing Pixie, that could be a card that reallly needs to be in this maindeck, pick Case back up, get another kill, pick Imodane's back up, swing for anthem...