Is heirloom guaranteed after 500 packs?

Excuse me, I've been hearing a lot about heirlooms in the cryptocurrency and finance world, specifically in relation to certain packs or collections. Could you clarify for me if there's actually a guarantee that one will receive a heirloom after opening 500 packs? I understand that heirlooms are often rare and highly sought after, but I'm wondering if there's a set number of packs one needs to open to ensure their acquisition. Thank you for your time and expertise in this matter.