Opening the box for the first time and going through its contents one at a time offers a lot more than any other set in the price, especially with how everything is packaged
If youre playing a deck that turns creatures sideways, you can almost always enable the cost reduction
While both Hallar and Verazol play very differently, with Hallar being an explosive Burn deck and Verazol being a durdly value engine, both have a ton of overlap in terms of the cards they're using
Before selling a card, they will have performed the authentication process described above applying their expertise from having seen hundreds of authentic beta APs
You'll almost certainly want to have at least a bit of both, however, As life gain effects will naturally allow you to pay life more recklessly, bringing even bigger creatures back from the grave
Examples: Dragon Trainer, Felling Blow, Banishing Light 2-3: Filler cards