My alliance currently runs blue tanks for war. I ran with Aegir for a while, then switched to Athena. My other options are Ariel, Frida, Isarnia, Snow White, and Alasie. The rest of my war defense is currently Mother North, Gravemaker, Oatmeal, and Seshat, in that order, but I do have lots of other options in the other colors.
Which blue tank would you use with the above defense? Why? Anyone else you would swap in for one of the other heroes?