This seed had THREE legendary jokers. Canio appears pretty early on, Perkeo appears near the end of the run, and Triboulet appears very early into endless. Also there's a Black Hole card in a Celestial Pack too. I don't remember where it was but I know it was before the second Soul card.

I should warn you, it's not super easy to scale Canio since the Hanged Man is quite scarce. The first time I saw the Hanged Man was after I got the three legendaries already. The most you can do with it before then is with glass cards.