They left both Panharmonicon and Temur Sabertooth in the board so you could probably switch those two in instead (although you'd be left with Cathar's as your only explosive wincon - which means maybe swap one Top for an Enlightened Tutor which was in the sideboard
Easy, the green is solid and has only four red dots in it in an L shape
Prices are competitive where the inventory exists, but if you're hunting for a specific raw uncommon from an older set, TCGPlayer probably has more options
Magic needed enemy-color dual lands, and the enemy versions of the M10 lands seemed like the right version
Not only does this set massively expand the world of Lorcana with new characters and mechanics we havent seen before, it looks like its going to be a ton of fun, too
I, too, am a fan of Aura Mutation in the land of big enchantments