[Standard] Heroic Lockdown: How's it look?

[cchaserobbins]

Heroic Lockdown

This midrange deck holds my opponent at bay and combines heroics with flying creatures for an overhead assault.

This is my first *real* shot at creating a standard deck. I know it could use some more TLC, but I could use some advice to steer it that way. What do you think?

[Sgtream]

I like the supreme verdict, and detention sphere. I would narrow down to sets of creatures instead of 12-single creatures. Mono black would be an issue or a fast creature deck... what is your sideboard?