This item was originally known as Elixir of Elusiveness in the alpha phase of the game.
It was removed because it primarily benefited AD carries that were already in the lead, making hyper carries even stronger, and pigeon-holing end-game AD builds to focus on critical strikes.
During some seasonal events, the Elixir of Agility's name and picture are changed, although the effects remain the same.
During The 2010 and 2011 Harrowing events, it was changed to Piece of Green Candy.
During the 2012 Lunar Revel event, it was changed to Green Tea Kettle.
During the 2012 Great Hunt event, it was changed to Fury Fungus.