Something i don't understand with the list :
I assumed you are hoping that multiple threats (mandrakes, many scourges, skyweavers, spiders, solitaire) operating separatly will make your opponent lack focus and keep your army going. But what part do the Guardian Defenders (footslogging) play in it ? Are they rushing in, staying at range ? If rushing in, wouldn't Storm Guardians be better ? If staying at range, maybe rangers ?
They army looks great, i just can't understand how you'll use the troops.