Amsonia
This cars makes me think of the Children of Lir, the kids were bound to 3 lakes for 300 yrs each until st Patrick broke the spell. It's an Irish folk tale.
Check out the review of the deck on the queens sword, the artist answered this exact question. I can't put the link sorry.
You must be referring to this post:
http://www.thequeenssword.com/pagan-otherworlds-tarot-review/
And oh, it does have a beautiful explanation about the swan right there:
Thanks for bringing this interview up Beanfeasa and for giving the link EmpyreanKnight!
I'm thrilled to have all these new perspectives on this image...these cards are so great...minimalism on the pips but still deeply evocative!