Buy ~200 tokens with gold. Leave the casino and re-enter to trigger an auto-save. Play 10-token poker until you win a hand, and double down a bunch.. They aren't worth it to equip, but are unique.

Other than that, save your Tokens for the next Casino in Act 2. Larollexie ....

It's so boring and I barely get metal mode....and poker gives no payout at all.. The games at the monster casino are rigged for you to win. The currency you get can only be used during that part of the story and disappears ....

Normally wouldn't spoil this but since you asked directly, this is not the only casino in the game. The other casino will have different prizes..