Thank you for the comment!
- There is a collective pile, made either from extra cards, or from the discarded cards.
- You can print as many cards as you want. 3x player is the ideal for most game modes, but you are free to try more.
For more insights: this game was originally made for a Game Jam, and one of the rules was to have a deck of max 18 cards. What I shared here is an expanded idea, trying to cover as many modes of game as possible and giving players freedom to improvise.