Just give up on HS. The last expansion had so much powercreep in it that it made playing without draining your wallet became impossible. Not to mention that the game will have a battlepass in it soon. HS is finally dying, let it rest.
Try Legends of Runeterra instead. Well, if you can stand supporting Riot's sexism and Tencent/China's holocaust on Muslims and the other crap China is up to.
Aside from political issues Runeterra is both better (IMO) in gameplay and and in generosity with cards.
I was actually thinking of getting into the Chaotic Card game after seeing a starter deck lat year at a local hobby store. Problem is I'm not the only one.
There has been a resurgence in the last few years. Kids and preteens who watched the show are now adults with the cash for those cards. Since they went out of print around 2010 its going to be hard to make my perfect.
Anyway, since the release of Legends of Runeterra I mainly play this for my card game cravings.
Gameplay-wise it's just SO much better than Hearthstone. Also it's faster than M:TG.
I absolutely love it.
If you like Hearthstone but not spending money on it, try Arena.
Pays for itself with the gold rewards and daily quests.
Doesn't help if you only like constructed decks, though.
Having spent money on almost every pre-order, I can say with certainty that it is a poor investment of money. Literally spending enough money for multiple triple-A games and not even getting everything the expansion has to offer.