I saw for 30% off Night Hunter Rengar in my Lunar Reveal shop and then when I went back to buy it it had changed into Head Hunter Rengar for 30% and I would like to have my Night Hunter Rengar back so that I can buy it. 
Please spread this out because it would help alot if a rioter saw this and gave me my Night Hunter Rengar back
Epheamenne1 votesI'm leaving this post here for Riot staff as it has to do with this issue and the RP Purchase Error that came with it.
I had a very similar issue with Jinx just now. I was going to buy Mafia Jinx/Jinx at 70% off only to find it updated with Firecracker Jinx/Jinx. I believe ( but am not sure that ) the resets are intentional. When I tried to buy the updated Jinx set though I found the shop had an error with the Jinx skin and other skins were still able to be purchased. You can read in detail ( steps to recreation, etc. ) about it here.
Corpral Swag1 votesI'm so sad all I want is to buy the Night Hunter Rengar skin for 682 rp Riot please do something about this when the Lunar Reveal Shop got taken down for maintenance i thought that it would be fixed but no it wasn't
Corpral Swag1 votes:(
Zombiemaster1 votesAny skin that is scheduled to go on sale in February was replaced by a different skin in the Lunar Revel, and Night Hunter Rengar is one of those skins. On the bright side, you get to purchase the skin at an even bigger discount.