Let's list them in an ascending rarity order so you can see the rarest at the end. Expect to pay: $180 for Young Ryze, $220 for Black Alistair.
The rarest skin in all of League of Legends history is Rusty Blitzcrank. Silver Kayle comes with a retail copy of the Collector’s … A similar version of the skin was rereleased in 2016 but the original one is still considered rare. I've put many hours into the game and most of the champions except the very recent new ones are owned.
