Booster packs do nothing. I am not spending a single dollar extra on top of the $30 I spent already. I bought a box and a pack for $20 basically. Here is the result:
1 5star card.
1 4star card.
around 3 3star card.
less than 10 2star cards.
Rest are 1 star cards.
I had relatively better results with the first $10 I spent as they yielded almost the same number of 3+ star cards. You have no idea how depressing it was for me when the 75 cards opened only to see the list of 1star cards starting in the first page.
And I read somewhere that leveling after 10 has very high chance of yielding rare cards. Well, I just hit 20 and boy was I happy when I had to choose between 4 2star cards.
After 20 levels, over a 100 battles, and $30, I am still not using a single 3star card or over other than the ones I got from the starter deck.
I just depressed myself again after remembering that "box" purchase