I had a big long post about all the infinites this generates and then...oops! Things are new objects when they return to the GY, so it would be EXTREMELY challenging to actually infinite with, say, Hope of Ghirapur + a sacrifice outlet since you'd need to exile two more legends each time.
As a result he's a lot less interesting, although Urza's Ruinous Blast or Kamahl's Druidic Vow every. Single. Turn. Is still pretty good.
RCRDaretti: Superfriends Forever RCR
WGBDoran: Ent-mootWBG
GGGMultani: Group Bear HugGGG
GB(B/G)The Gitrog Monster: Dredgefall DurdleGB(B/G)
RGWGahiji, the Honored Group Hug MonsterRGW
UB(U/B)Yuriko, Ninja Trinket AggroUB(U/B)
WUBRGAtogatog: Assembling a OHKOWUBRG