Pretty cool concept. Think I encountered a couple bugs though. The price of increasing hand size resets after every battle. Additionally, the subtraction operand was already selected when I started a battle a couple times.
I have fixed the hand sizing pricing issue (it’s now based on the size of your hand e.g. 7g for 7->8 then 8g for 8->9) but I’m not sure why the subtraction thing is happening so I’ll keep looking!