Monthly photocard tier???? 👀 (Patreon)

I'm planning to add a new tier to my Patreon, where I will send patrons an exclusive photocard every month!

The tier itself will be $15, and there will be one photocard (and possibly one sticker) sent to you in the month after you're subscribed (for example, if you subscribed in June, you will be sent the mail in July). When I open the tier, it will only be limited to 50 patrons and US residents only.

I'd like to get some input from you guys. Would you rather have:
> one design per month -- guarantees that you'll get that exact design, or
> several designs per month -- you cannot choose which one you'll get; you will receive a random photocard?

Let me know if you have any questions/interest in the comments below!