This "forbidden" League of Legends build infinitely buffs almost every stat in the game, and it's probably going away forever next month

gamesradar.com:

A League of Legends number cruncher has discovered an unstoppable build that keeps infinitely increasing every stat in the game, and they want you to try it out before it gets removed from the game forever.

Senna is part of a small group of League of Legends champions that keeps growing stronger throughout the entire game. While most characters stop improving once they've reached max level and filled their inventories, some of them have spells that keep increasing certain stats indefinitely. Senna, who collects souls from defeated enemy units, gains attack damage (AD) for every soul, with additional attack range, crit chance, and life steal for every 20 souls she gets. 

At around 60-80 souls, Senna is widely thought to have 'scaled' - a League of Legends term for converting relative early-game weakness into late-game strength, and the opposite of 'falling off.' But she can go on collecting souls as long as the game itself continues to run, theoretically allowing her to grow in attack power forever. Normally, that strength is a counter to her squishiness and lack of mobility, but one player has managed to get around that particular issue, by coming up with a build that allows Senna to continually buff every important stat in the game.

In a post on Reddit, one player has created a Senna build that they claim scales harder than anything in the game. It starts with Senna's own kit, which increases all of those aforementioned stats automatically. As her attack damage grows, so does the healing and shielding, and enemy slowing on some of her spells - the latter of which eventually reaches 100%, making it a root, not a slow. But it's once Senna starts building items that things start to really synergize together.

The build