While there is an embarrassment of riches at the five-spot, if we end up playing any Cloudblazers, theres nothing wrong with a one-mana draw two, gain two. Of course, we could also put Eldrazi Displacer in Spirits, though the more we go down that path, the more it pulls us away from Spirits themselves
Abilities that trigger when a player casts a spell (like Mirrorwing Dragons ability itself) wont trigger
Rowan, Scholar of Sparks and Will, Scholar of Frost isn't just one planeswalker, but two
I guess she's mainly just a shift target for the Floodborn Mim and for that reason she is probably barely playable, but I'm not thrilled about it
Iron Man, Titan of Innovation Iron Man, Titan of Innovation is one of the more literal pod commanders thanks to that attack trigger