Riven Berf idea (MUST SEE)
For starters, why does there need to be a time limit? Make it permanent (until ult use) because otherwise it's just going to make Riven players divebomb the enemy team level 6 and most of the time either get really fed w/out ult or feed more than Singed. So make it like Rengar, stay till use of next ability. Next, Riven junglers (hemhem) have absolutely no way of building edge in the jungle without multiple ganks that take 40 years to build edge because you loose it every 10 second. Make large jungle camps build edge as well.
Overall make this Berf more into the Riven player's side of things, because I don't want to stop playing Riven because a stupid nerf made her even more difficult than she is.