I know a lot of people don't care for the "noobs" or beginner summoners. I definitely believe this should at least be 3/4 Star Shards to help them out.
I mean let's be honest, y'all know the "premium" crystals are trash, and 9/10 you're going to get a 2* champ.
EDIT: it should increase as you level up..
1-20: premium
21-35: 3* shards
36-45: 4* shards
46-60: 5* shards