Rakdos Control

On Theros Game day yesterday, one of the most interesting decks I saw was a Rakdos control deck. It ran NO creatures, and featured plenty of Man-lands and "activateable creatures". Before the final round, this person went 4-0. Here is a list (roughly)

4x Thoughtseize
4x Rakdos Return
3x Dreadbore
4x Hero's Downfall
4x Devour Flesh

Artifacts:

4x Prophetic Prism
2x Trading Post
4x Haunted Plate Mail
4x Rakdos Keyrune

Others:

4x Read the Bones

Sideboard:
3x Lifebane Zombie
4x Desecration Demon
...?

This deck is Rakdos control, so what it does is basically kill all your stuff. He has 7 planeswalker removal. All his creatures are either Mutavaults, the 3/1 first strike keyrune, or the 4/4 platemail. Most interesting interactions:

• Activate Platemail, then activate mutavault then swing
  
• Use trading post to sacrifice his prophetic prisms for extra card draw
  

Advantages of this deck are sorcery speed removal such as
-Supreme Verdict
-Mizzium Mortars
-Dreadbore
-Detention Sphere

All are ineffective against this deck. The best standard deck is one that blanks out cards.

Any thoughts on this?

I know it has a lot of removal but I think speed of Gruul aggro would be overwhelming.