So, while I feel an Autotomize set with Iron head, Sacred sword and Shadow Claw will be a great set, I had an idea I wanted to throw out there, I just thought of it, so feel free to tear it apart :)
Aegislash@Air Balloon
252 Atk 252 HP 4 Spd
Brave Nature
Swords Dance
Kings Shield
Iron Head
Shadow Sneak
While the balloon may seem like a waste, taking up either a life orb or leftover spot, it could in theory, stop some of his counters, namely Landorus-T. In the first set for example, he switches in when Aegislash Sword dances, his only choice at this moment in time is to either try and U-turn out, first time going down to -2 due to kings shield, the 2nd time, u-turning out for minimal damage, while Aegislash gets another sword dance, taking him to +3 for whatever poor thing switches in. The other choice is to stay in and try and pop the balloon, in doing so, Aegislash uses kings shield, putting him at -2, the next turn he pops the balloon, but Aegislash sets up to +3. Aegislash now 2HKO's with shadow sneak, while Landorous can only 3HKO.
I suppose Lando-T could EQ 1st turn, predicting Aegeislash to Kings Shield, but he can still only 2HKO, while getting 2HKO by priority in return, and that is risky as hell.