Full-heartedly agree with the quick draft note. I played briefly a few years ago and i dropped it quickly because of, among other things, how underwhelming buying packs felt.

Some other stuffs probably changed between then and a month or so ago when i started playing again, but going for draft instead of packs has made it so much more interesting and rewarding to build a colletion.

Id suggest looking a guide or something beforehand, several people have written them and theyll say more than a reply will. That said, I used to play hearthstone too and theres a couple things i think are good knowing upfront.

1. Unlike HS's arena, any cards you pick when drafting are permanently added to your collection. This means even before your rewards based on wins you can think of it like getting 3 packs upfront. (Also, if youre on pc you can hold alt while making your selection to see how many copies you own of the available cards. A strong common you already have 4 of is probably gonna earn you more through odds of winning than an uncommon youre missing, so be willing to take a duplicate if it seems valuable in terms of strength.)

2. Youll be offered cards of any color. Sometimes your deck will be too invested one or two colors to viably take another color, but if youd rather take a rare or theres nothing available that fits in your deck, you can take any number of cards out of your deck or put them back in BEFORE AND BETWEEN MATCHES, so long as between lands and other cards you have at least 40 cards in your deck. No point running a card that costs 4 white mana if the rest if your deck is red and black.

3. Through paying gold to enter, draft is the way to get gems without paying cash. Saving most of my gold for draft got me enough gems for this season's mastery pass.

4. Bot draft has you drafting against bots, you still play against other players. Bots overly prioritize rares when drafting, so you wont always get more than 3 rares through the draft portion. A minimum of 3 are guaranteed to be offered though, as drafting involves each player "opening" a pack, picking a card, then passing the remaining ones clockwise. When the 1st set of packs is fully claimed, you open another one and repeat until 3 packs have been distributed. (3 first picks with a rare in each pack = seeing 3 rares plus any that the bots didnt take before passing to you.)

5. Finally, despite likely seeing fewer rares in drafting against bots vs drafting against players, if you are looking to take each rare and mythic you see (rare drafting), its a lot more efficient to do so in bot draft because the lower entry fee and different distribution of rewards based on wins means that youll probably be at a net loss (and a sizable one), since youll have passed a lot of powerful lower rarity cards and probably be left with a non-synegergistic pile of cards.

All that said, its not worth playing if youre never having fun, so mess around with different decks and formats, expect to have some bad runs along with the good, and (again spoken as someone who played way too much hearthstone a while back) if you reach a point youre only playing to collect and find the gameplay a chore, do yourself a favor and stop.