Here is another Commander winner - a new form of the Thassa goddess. There is also a big chance that it will see play in the current Mono-Blue Devotion decks in Standard, Pioneer, and Modern.
All this should play a big role in Thassa's price formation. Currently it stands at about $20, but it may go up if it proves to be better than its predecessor Thassa, God of the Sea from the original Theros set.
On the other hand, if it shows little support in eternal formats, then it will probably shrink to about $10 a piece.