I agree this shard needs to benifit air more. Every elements has some easily accessible airborne creatures, at least some dragons, so they can have the max benifits without really being air.
Some good creatures from other elements examples:
: phoenix, ruby dragon, seraph
: vampires, gargolyes
: Bone dragon, condor
: forest spirit, jade
: Pegasus (major benifit), Archangel, RoL even
etc etc.
Perhaps if mark is air, percentage chance for each SoF increases from 15% to 25%, or extra dmg or all air creatures automatically bypass shields with same chance to deal extra damage?