When I first started buying collections, I used to feel bad making offers far lower than the buyer's asking price
Notable cards include Thought-Knot Seer, Matter Reshaper, and Chandra, Flamecaller
Since this format is a random mashup of both sets without curation, it means that you should focus on the power of your deck rather than trying to make certain synergies work
It's worth noting, at this point, The Pokemon Company hasn't confirmed when or how these will be making their way to the English-language version of the TCG, if at all, but you have to assume it will be part of another set of collection boxes
Here are the basics: 40 Cards: A limited (sealed or draft) deck is a minimum of 40 cards, but you shouldnt go over 40