Looking at your roster, everything will depend on what area you need to improve.
You have a Ninja, so you've been at it a while, you only have 7 60's, so you're a casual player, am I in the ballpark?
I'll assume you should focus on dungeons first, especially getting to 20 so you can farm 6* gear. Dragon is the easiest one, but Drex can also help in Spider and FK. If you can hit Dragon 20, I'd look at ColdHeart and Apothecary as they can help with both FK and Spider. For now, you need gear more than anything.
About Giscard, he is a beast of a control champ. If you didn't have Scyl, I'd say Miscreated Monster is a must, and for Spider, he still is due to the shield he provides, but can't go wrong with Giscard. Question is whether he benefits you the most right now.
So I'd say tell us where you are in each area of the game, and we can work towards the solution toether.