Got SR Infinity from helping out a Wiseman, quite annoyed actually because I actually dealt 3 mil. damage only to get a loot that's already available from the normal bosses. Getting to Gold (3 mil. damage) when helping out friends just means there's a higher chance of getting better loot, not sure if WW and Hamel Cane are gold exclusive. Silver is 1 mil. damage and bronze is anything below that.
When I get UR Wizard, my team will have, UR Joker, Wild Chalice, Skull, Eternal, Wizard, Kinght Survive, OOO Super TaToBa, Birth, SR Ryuki. If I get lucky and get UR White Wizard, I'll swap out OOO and Birth for WW and Sorcerer.