So, I have every champion and I was saving 3 champion shards for when the next champion came out so I would save 7k IP (not that it really matters, but whatever) and instead of unlocking Taliyah I got a permanent shard for Fiddlesticks. 
You generally need to wait a day or two before hextech crafting has the new champ added to its pool unfortunately.
On the other hand if you have every champ, I feel like you probably have ip to burn as well, so getting it the traditional way is probably still viable.
You must do it a few days after the release of the champion or it wont' work (Idk why)
