Shanya, is predictable, Gaia isn't
Buck is really weak against soa or sob he is a 7/7 while Lulabee is always 9/6 and can beat attack clans easier and owns sob which will hurt Buck
Praxie is beaten by attack clans while Chiara can be a 8/4 allstar basically, very strong and what you need for survivor
Anton is not needed, too weak, and horrible damage besides, you need a DR
but you forget that Praxie is a superb card in survivor for he can go through DRs
I've even gone as far as to replace chiara with Praxie just on that thought alone.
While you can keep Corvus, corvus' damage is too low for survivor any -2 damage min 1 card can kill him. Now he has the PM but the issue is with survivor is that if you make a wrong prediction with it, it can be lights out for you and you will lose your streak.
Anton to Redra (that is an obvious change a DR staple vs Anton...)
Corvus to Aylen (you need to nuke and Aylen is that nuke. She can avoid DR and is one scary card to face. you can use caelus as well but a) he is banned all the time b) a lot of players run atk manipulation decks so his powers will be a bit hindered.
Danae to chiara (once again this is a staple issue. While Danae offers strong atk manipulation, chiara's revenge ability is overwhelming for any card.
Shayna to Gabrielle - every survivor needs a flurry of defence. Gabrielle offers that.
Buck to Lulabee - lulabee's SOB isn't nice to face in survivor.