Wisteria went through many iterations. His general design didn't really change, it's just that I was constantly unhappy with each drawing I made of him. This was supposed to be my final attempt at making an icon of him to appear in the upcoming DnD session, but I hated how it turned out. Luckily the session was delayed, so I had one additional week afterwards to make yet another new drawing (the fifth, at that point), which turned out great.
Each of the eight suits in the Opus deck consists of twelve cards: Numbered cards going from zero to nine, and two copies of the face card associated with that suit.