I don't forget you about the summoners 😀 My alt-account took some cards... But they're coming...
I don't have any tips. I was lucky to get into the game early enough and it was able to fund "itself" a bit. In the week, I'll delegate you some lvl2 summoners (death one today), maybe it will help you. You can look to https://splex.gg/ to have some stats about your battles...
Have a great sunday.
👍😊