Your system is inconsistent, broken, and pointless. Here's an example- If I send my entire army at a neighboring Redblood base, I will inevitably lose about 50 NB. However, if I send the army without the NB, I don't lose anything. So basically, sending NB makes my army weaker. Some people have a theory that this is because the units move a different speeds. If so, then you have the most retarded battle system in the history of mankind. The entire army needs to hit at the same time, There are no circumstances under which I'd want part of my army to needlessly die. The point of the troop speeds should be to allow me to send out specialized task forces, such as all-Bat raiding groups. It shouldn't be to kill all my fast troops in a general attack.
Furthermore, there doesn't appear to be a single reason to ever build more than one Flickerform at a time. (and only then if you want to use them as a Griefing tactic, to annoy your neighbors). Building more than that doesn't do you a damn bit of good, because unlike REAL strategy games like Grepolis, having more of them doesn't increase your chances of success. Instead, TON, being brain-dead, just treats them as a really weak unit. The irony is that the only ways your Spy will EVER come back alive is if your target has their wall on Evade, thus making it so that you only needed one, or you send them with a giant army, in which case you didn't need them AT ALL.
Seriously, if Kabam put even one tenth of the work into fixing the battle system that they put in to half-assed attempts to wring money out of us, this would be the greatest game in the history of the world. But they don't. Instead, they do the absolute minimum they can possibly do, and they don't even do that well.