So, SR Miracle Ticket is available from the new Panel Missions. I'm surprised there isn't already a dozen questions on what is the best SR to get. Well, maybe that'll happen tomorrow, since it's rather easy to take your Gem Gachas before you reach page3, locking you out for today.
And on a slightly related note, no, I don't have a good answer for who are the best SRs for each element.