assassin icon??

{quoted}

Yes, it's kinda easy:

Invent a time machine and travel back to the time where team builder did still exist. Then queue up 5 times as assassin.

After playing this games, the icon will appear in your summoner icons.

Haha. I actually enjoy theoretical physics. In terms of actually building a time machine, I suggest you read up on time travel from the works of the following people:

Albert Einstein Stephen Hawking Neil deGrasse Tyson Michio Kaku Brian Greene Paul Davis

Time travel actually doesn't outright violate the known laws of physics but its so incredibly difficult to do that we might not have any technology near that ability for thousands of years.