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
Show both front and back of each card, and highlight any flaws honestly
Ixalan as a whole has shown that introducing new cards into Modern naturally through the printing of new sets is the best way to shake up the format, and that the cards on the banned list are there for a reason and can stay there
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
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