What dictates when a champion gets a "Legendary" skin?

Good to know thanks bunch!

So there wont be an opportunity to buy zombie brand again?

disappointing riot....really? u guys r just gonna throw away skins just like that. People r already paying u heap of RP (money) each day so the least u can do is to keep the skins in the store as people may prefer those so called legacy skins. Still a very big disappointment.

i hope new new skin for kennen

Hmm

watch my video in youtube pls! http://www.youtube.com/watch?v=5qZepkDeN_E

*******http://img15.hostingpics.net/pics/625372774788543790742306145816134627o.jpg********

Is this an new skin coming up for Annie? Is it a fan art? Ancient skin that they took off? Please, answer me.

Will be Awesome if fix Taric skins, i mean the normal skin have a Cloak, why the rest of skin dont? and WTF Bloodstone taric hair? it doesnt look like that in the picture.

This is so unfair, I've always wanted the Riot Squad Singed skin and now I can never get it even though Singed is my fav champ and I main him, this is just so stupid, you should never release a skin once only because some people either don't have money at the time or may be on a holiday somewhere and they are unable to buy the skin, all skins should be released again at some point.

I am so disappointed this is just pathetic....