This is just preliminary work, but Dragon's Maze gives Grixis some very powerful pieces, even from the small sample we have now. Far//Away and Ral Zarek come to the forefront right away.
The deck doesn't have trouble at all in the aggro heavy meta with all the removal it can pack. The sideboard is geared more towards the control matchups
2 tribute to hunger
1 devour flesh
3 searing spear
1 dreadbore
1 rakdos charm
2 dimir charm
2 izzet charm
3 far//away
1 Rakdos' Return
3 Think twice
3 augur of bolas
3 Olivia Valdaren
2 Thundermaw Hellkite
3 ral zarek
1 Jace, Memory Adept
25 lands (Grixis colored obviously)
4 negate
2 toil//trouble
1 mark of mutiny
2 rakdos’ return
3 slaughter games
1 counterflux
2 rakdos charm
The deck doesn't have trouble at all in the aggro heavy meta with all the removal it can pack. The sideboard is geared more towards the control matchups
Also don't underestimate niv mizzet buries people like a revelation.
Id really want 1 nicol bolas. I don't think I have lost a game I have cast him.
Pioneer:UR Pheonix
Modern:U Mono U Tron
EDH
GB Glissa, the traitor: Army of Cans
UW Dragonlord Ojutai: Dragonlord NOjutai
UWGDerevi, Empyrial Tactician "you cannot fight the storm"
R Zirilan of the claw. The solution to every problem is dragons
UB Etrata, the Silencer Cloning assassination
Peasant cube: Cards I own