While there are others more qualified than me to discuss concepts like trading up, one thing I do know about trading is you are going to end up paying the piper (a spread of some percent or another) sooner or later if you decide to turn your cards into cash
The main commander for the deck is Kasla, The Broken Halo
Unlucky draws can make any deck feel terrible, and conversely, getting a lucky opening hand can give you a false impression of a deck's power
Trainers that carry games (and why) Draw Supporters keep hands live every turn
Exclusive Promo Cards : 1-3 foil promos, typically full-art or stamped cards (e.g., a gold Charizard ex in Obsidian Flames UPC), exclusive to the UPC
That fits into the flavor of green, whose hostility to artifice justifies its near infinite ways to destroy artifacts