@Riot Question regarding mystery stuff
At what point is the mystery champ/skin/icon/ward revealed from Riot's point of view?
I ask because I would love to get Tahm Kench and I still haven't logged on to receive my free mystery champ. I would like to wait until TK is released before logging on. That would increase my odds of getting him from 0% to 10% (I currently only have 9 champs left).
So is the mystery champ/skin/icon/ward determined upon purchase or upon the player receiving it?