Oh, and P.S.
I've now rebirth 6 times at 500, and once at 1000
I have gotten ZERO fantasy shards from shardkeepers.
My running total is:

Fire: 31
Water: 27
Earth: 23
Electric: 23
Dark: 23
Light: 22
Fantasy: 7

I've got to say that fantasy shards are either intentionally or unintentionally (i.e. it's a bug) not coming from shardkeepers. Unlike all the other shards.