How?

Right, look at this guys profile : Viewing profile for TriasEU on the EUW server - League of Legends Quickfind

He's making teams with 5 of the same champion, anyone know how he's doing it?

EDIT: he is streaming http://www.twitch.tv/lnsero

From Reddit:

"Riot specifically added a picking mode that allows this a while ago; I'm surprised that it's remained more or less undiscovered for this long. Internally, this mode is called GAME_CFG_BLIND_DUPE. While there's no way to activate this mode with the live client, it's quite easy as a developer (or if you simply mod the live client).
The mode works mostly as you'd expect: you can pick champions multiple times, and they're all playable in game. There are a few cool quirks though, like picking 10 Dravens and catching axes
Here's me using it:
Champion select: http://i.imgur.com/ThsYRPj.png[1]
In Game: http://i.imgur.com/IC5PJo7.png[2]
If you want to use this yourself, keep an eye out on Reddit (or, it might be easier to follow @AstraLfoxy[3] ). Sweet Stuff is arriving next week, and I think you'll freaking love what you see.
EDIT: Check back in an hour, either here or at Twitter[4] . I'm working on a mod right now to let you guys enjoy this new picking mode."