This is the strategy I used I put in $100 and bought all the common and rare cards I then played for about 3 weeks and used everything I got to buy epics and the champions I needed to make some decks it is a good way to do it in my opinion and then I put in another $100 and just bought all the cards I am currently crystal hoarding for the next expansion to now go everything F2P
This is why you should get the game on your mobile too in case the internet goes out you can come back with data
This deck was pretty good but I had trouble against deep decks
This is the strategy I used I put in $100 and bought all the common and rare cards I then played for about 3 weeks and used everything I got to buy epics and the champions I needed to make some decks it is a good way to do it in my opinion and then I put in another $100 and just bought all the cards I am currently crystal hoarding for the next expansion to now go everything F2P
https://imgur.com/a/3L0EFNi
Sorry I dont know how to insert the picture manually