@Pedros- Thanks for the shell. I know you are new to it, but last standard we played a R/b deck and I played it to death for many months. This has that same feel with Exava=Aristocrat, Dragon= Dragon.
Rakdos Returnwas great the one time I cast it, Round 1 vs U/W we only had 5 minutes left going into game 3 after I won a 25 minute Game 2(holy shit). I got an early RR on him to put him to 1 card , which happened to be Rev. But that was really the game right there.
I think it could easily be a 1-of in the maindeck, no one is expecting it at all. I also bluffed it a lot, asking how many cards were in their hand and counting my mana.
[card]Toil/Trouble[/card] - Also
was good, I liked the 3/1 Split but could easily be 2/2 between this and RakRet. Hit for 5 on turn 3 against U/W and that was enough.
Thoughtseize- Could have played it for sure, maybe its better than Toil/Trouble. I have yet to play with the card ever so I don't have much say on it. I like how the 1cc cost fits right into an aggro plan of casting 2 spells a turn. T2 Jester, T3, Rat, Thoughtseize, etc.
Though, with all the good B/R removal, there was rarely any card I was like "please dont play that card!" I felt prepared to destroy anything.
Dark Betrayal- Spectacular, could easily run 3 if the metagame calls for it. Won me a top 8 match against G/B midrange. Had 5 total mana. Was able to Tap 3, make a Rat, activate Mutvault, AND Kill his guy with Betrayal.
Whip would have been really good, though Chandra did win me some games but she never "Got going&
quot;. The few games she won , the MonoU was at 1 life and ping had him dead. A few topdeck Chandra to remove the blocker presenting lethal. So she never grinded for me.
This deck defends worse than any aggro deck I've played in that most of the creatures can't block or suck at it for the most part. Many games turned into "races". Sometimes where I could attack favorably, but it wouldn't kill them and I had a good chance of dying on the swing back. Particularly vs Mono U and Red Devotion and also White Weenie. Whip would have been awesome in those situtions.
Whip is certainly something to consider. Lifegain is never bad in this deck as it gets us more time to get Rats online, Dragon out/monstrous, etc.
Assemble the Legion - Just not needed..You have Dark Betrayal and Dreadbore and Ultimate Price which makes it incredibly easy to just keep their board clear and kill them. I am not worried about Mono Black at all...might be one
of the deck's best matchups.
Love the discussion we got going here! Was hoping to wake up and see that this blew up and glad it did. All aboard the rakdos train of destruction!!!!
Control 
- you can play Pact Rats but it won't be T2 which is a major issue for Ux Devotion MU.
