The custom part of the deck should be larger. Only 5 of 23 means you rarely pull the cards you add in, making it almost redundant, and you should be able to save multiple hands to change between. The RNG needs a lot of work. It's predictable, which means it's not random at all. Players will often start with the same hands, you can predict the dice they'll have and play based on what is needed to win. That is the biggest issue and needs addressing.