On to the card
4CP : Water/Ice
Forward
Job : Warrior
Category : Type-0
Legend
9000 Power
“The Water Characters you control cannot be broken by opposing Summons or abilities that don’t deal damage.
When an Ice Character you control is chosen by your opponent’s Summons or abilities, choose up to 1 Character. Dull it and Freeze it.”
That first ability is all you need, as Sophie is Earth/Water she counts as Water. (Correct me if I am wrong.) With her not being able to be broken by abilities or Summons that don’t deal damage, she will most likely not be able to be broken if you have enough Earth and Water Forwards on the field. It is simple as that.
Now, how will you pay for Celestia without having to make a tremendous change to your deck? Very Simple. Tyro (11-072R). With Tyro, you can dull him for 1CP of any color. I’ll 
keep saying it, too. Great card, if you play Earth you can splash any other color you’d like as you’ll have a way to pay for it.
That was my take. And, then I took a look at FFdecks.com Ashe’s Prison was the deck.
https://ffdecks.com/deck/5358425582075904
And, saw something I did not think of. I never said I knew everything. But, apparently you can pair Celestia with Minwu. Your Water Forwards will be unbeatable. And that deck looks like it would be fun to play.
Let us know what you think in the comments.
At 2CP, this card is a no brainer. And with those abilities, she’s deadly. starting at 4K, but each Earth or Water forward gives her +2K. You can just throw her in a deck with Vikings and call it a day. Now if you control 3 other Forwards that are either Earth or Water, she’ll have 10K. And, at 10K she deals your opponent 1 point of Damage at the end of the turn. Your turn, and your opponents. The game will pretty much take care of itself if you just pass and defend Sophie. 
Let’s take a look
Looks like we’re playing with Final Fantasy Tactics. As we mentioned before, in the Water Review, about the little combo with Marach (13-080C). You will need to find a way to be able to splash different colors. I was more excited about this card when it was released, but now it seems like will work better in a theme deck. Which is not a bad thing. I have yet to look into new decks to see how this card is being used. My guess would be a Lightning/Water deck. Not only to play Marach, but you also get Ramza (13-121R). 
Hopefully, you’ll play him for 4CP and your opponent will break a forward and return one to his hand.
5CP/Lightning
Now, we’ll need to search for Behemoth K, and there’s no one better than Aldo (10-086C) who will search for a Lightning forward. Not only will Aldo let you search for Behemoth K, 
but also for Illua (5-099H). and, everybody loves Illua. And, you can’t forget about Estinien (6-088L). Behemoth K and Estinien is like having Hulk Hogan and “Macho Man” Randy Savage on a tag team. Wait, they were a tag team. The Mega Powers.
On to the Stats.
Let’s find some searchers. Epitav (6-067R) and Kolka (7-069C) will both let you search for Leo. While Luminous Puma (8-080C) will allow you to grab Leo from the Break Zone. You might as well grab Larkeicus (9-076H) to be able to grab Luminous Puma from the Break Zone or to search for him.
when Luminous Puma is put from the field into the Break Zone, you can search for a Luminous Puma and add it to your hand. You can add all sorts of Monsters. Especially ones that turn into Forwards.