I had no rare joker before opening my 6th pack and I got a rare joker in it so that is 2 total with the 6th pack opened rewards. After going in m'y collection to craft m'y first Codie, Vociferous Codex copy, I wanted to craft another rare but found out that I no longer had any. So I checked if I had multiple copies of Codie but I only have 1. And all that happened under 30 seconds so I am certain I havent craft anything else in between.