Championship Riven making a return.. Riot Squad SInged next?

that would be great, aside from myself i dont know anyone else who has the skin, and it would be nice to see it on the Rift especially since his Gas is a different color!

There's differences here. The Championship skins are still semi-available through Hextech and Mystery Gift, since they're all legacy. The Riot squad skins are Legacy BUT they're also convention exclusives, which means that they have a lot more unobtainability than the Championship skins, as the con exclusives are never available through Mystery Gifting or Hextech.

Championship Riven will never be on Hextech. The only way to get it now is to have a perfect bracket for Worlds.