Dawncaster is excellent. I was amazed at how deep the game is for a mobile deck builder.
It also uses an expansion based monetization rather than micro transactions and the expansions absolutely aren't necessary to get a lot of enjoyment out of the game.
I really liked Dawncaster but then I didn't play it for awhile and when I came back it had changed significantly and all the builds that I used to win with consistently no longer worked out. Honestly it's probably more balanced now than before but I haven't spent enough time with it to get good again.
Honestly I’m just bad at it so I rarely finish a run regardless. But it’s fun at least, and I bought the expansions mostly to encourage the business model.