Really, a brilliant idea.
For the next one though, I suggest that the Splinterlands team focus more on less exclusive and expensive things.
Think about it: you need new players and keep a high retention rate of the existing user base.
If many Novice-Bronze League players feel left out because they feel they have to spend more than they can afford to compete, well, that's not going to work well for the Splinterlands community, in general.
Don't overdo the inflation thing too much. Remember: although the money comes from people who can afford to buy many packs, lands and so on, in the end, the future and success of the game itself depends on the number of people who will play it. If it ends up being played consistently by a few richer people ... it won't end well.

We are a long way from that point for the time being, because at the moment the game offers many possibilities for people to play, invest and grow their resources while having fun.
Don't create classes. If you can create a game in which anyone, after purchasing the summoner's spellbook, can compete and, with a lot of effort and dedicated time, can get their hands on expensive cards, you will have won. You will have created a game in which those who want to spend do it, because they are impatient and don't want to spend a lot of time grinding in order to build a strong deck and those who don't have that possibility, build their deck by playing (even if they have to invest in more time and effort). Do not be impatient in your turn to see the return on the investment of time and effort that you have put into creating all this because you will end up ruining it.