It makes sense that you wouldn't be able to draw more shards of serendipity with itself, and having it not give other shards is fine, I think. Giving nymphs I think would be balanced (you can get them off nymph's tears or mutations, after all) but if zanz doesn't want it done, that's fine, too.
Can you get pillars/pends off this card, or 'other' cards like gavel?