There are about 300 cards to collect, including Bulbasaur, Sizzlipede, and Zapdos, with more likely to be added in the future
If you're buying packs to build a Standard deck rather than speculate, Foundations is the sensible choice
Uncle Deadpool is just crashing at Secret Lair for a few days
If you want to tell an epic story with your friends: For the Queen is a unique, impressively designed role-playing experience
Thanks to availability in the US being so low, buying one stateside is going to set you back $800 at time of writing
Like every newly released card, Battles will need to be evaluated on a case-by-case basis, given their mechanics don't seem to break the game pattern so much as to make them a semi-mandatory feature in every deck (unlike what we saw with Companions)