I'm sorry but $1 for a new account? Please share this secret. My account is ~$1.3K and I would struggle to get 1000 DEC in a day, including quest rewards.

With 28 games a day and 50% win chance that's 28x40x0.5 = 460 DEC plus 6 reward cards (valued at 94 DEC each but soon to go down) so a total of 460 + (6*94) = 1024. But keep in mind 40 DEC per win is with me using some alphas and gold cards as well as a guild bonus to DEC winnings. This takes me a few hours a day so its very unprofitable compared to my job.

How do you do this with just a starter set? I have 3 max level summoners and several level 4/3 ones and I struggle to get into diamond by season end and can only get out of gold 3 towards the end of the season.