In theory, spending G1C worth of 50k Jokertickets should give 1 Legendary. But I am still waiting for people to actually say "guys, guys I got a legendary from buying jt".
And btw I have another question: What's generally better? ISSR-A or B? People keep saying the B (Dog Ear) is better, but in the few hours I was able to play them both, I performed better with ISSR-A.