Before we get into the ranking of all the shapeshifter commanders, lets touch on the similarities between the changeling mechanic and the shapeshifter creature type
As the third set, Into the Inklands , introduced the new game mechanics of Locations to the game, Ursula's Return will also have " evolved game mechanics ," although specifics have not been released
You can block with it just fine, and you can always bring it back, as long as you have two mana
Any enters-the-battlefield abilities of the copied creature will trigger when Phantasmal Image enters
The key part about Celestine is that this ability doesnt cost you any mana to use unlike its life loss counterpart a few ranks back, leaving you free to spend all your mana on other things during your turn
Final Fantasy Commander Tokens has 11 cards in total, shown in the spoilers list above