User blog:Pigeonholed/Units to evolve with Sphere frog?

Dropping this here since I can't get into chat at work so I'm hoping for some recommendations as to what units my sphere frog would be good to fuse. note, these are all 6* with the exception of a 5* animal wisdom angel azael that I'm thinking bout evolving.

Oracle Sacred Flame Lava Guardian Taskmaster Lorand Guardian War Queen Ophelia Lord Great Golem (evolving in an hour or two) Lord Empyreal Drake Lodin (No SBB yet) Lord Bolt Magus Rashil (Evolving in an hour or two) Lord Ultra Blade Aem Lord Soul Vortex Lemia Anima Inferno Swords Logan Lord or Guardian Scarlet Hood Ciara (not leveled up yet) Anima Wisdom Angel Azael (not ready to evolve but close) Any suggestions as to who'd benefit the most from that 2nd sphere slot?