What I find with Pazaak is that it feels rigged, but it's either rigged for or against you predetermined. There were occasions where if I were down say 2 to nothing the computer would give me a break with a string of natural 20s. I'm talking suspicious stuff like 2 nat 20s in a row! Other games no matter what I tried the computer would beat me. I guess this would be just evidence stating that the game is truly random, except I find that it actually helps ME too much )
Try playing for card advantage. Refrain from using your hand cards and even hit on high numbers say like 16 or 17. You'll find that maybe half the time you'll get EXACTLY the card you were looking for to win, which if truly random happens about 20% of the time.