You need to choose a blockchain in which there is no transaction fee.
I advise you not to use other people's trademarks, such as "game of thrones".
In Russia, a very popular game is about tanks, there are many collectors in the game "world of tanks", the price of one tank comes to a hundred dollars.
So you can do crypto game about tank battles, I've played similar.
0xf1890fdc7905c882e1c00abb991914adf9307fa8
Not having to pay gas would be great. Nano?