First of all, getting into diamond with your own account so fast is already great. And getting into champ we all know is a lot about money, but you certainly know what you're doing.
At higher levels, do you think is there an element stronger than others or the game is balanced? I hear a lot about Fire because Yodin Zaku, but would like to hear you.
And a bonus question! Right now I just finished this season at Bronze I for the first time. Don't have much money to invest into it, but would like to know, what cards do you think I should BUY and what are better RENTING?
I had to rent 4.5k power on the last day to get into Bronze I and don't have any deck good enough to call main.
Hey @colonors thank you for your question and your observations.
In terms of investment the first things I would do in your position is to start collecting some summoners: Kelya (water) and Thaddius (death) both of them are sitting at 3$. Slowly you should be able to make them lvl 3-4 all the monster from common rare of these splinter can be rented for few Dec and you should be able to reach Silver 2-1 with a good water deck. Try to make a good excel and stay in the rent price.
Look for a guild, find somehelp for some ppl 75k power is nothing at end of season.
In terms of any element stronger... I would say nah. Every splinter is different with different rules. To some extent Yodin is strong, like Kitty is or even Chanseus. It all depends on rules and comps! I easily beat all Yodin players. So easy lul xd