I have previously piloted this archetype on last year’s Mtg Iloilo Year ender tourney and finished fourth place. That version splashed White for access to Chained to the Rocks and Boros Charm as well as the late game card Assemble the Legion. The version that I am currently working on uses Black as the splash color. This lets me use Dreadbore for spot removal and Rakdos’s Return for hand blowout and also discard spells like Thoughtseize.

I have checked a forum in MtG Salvation for reference build on this deck and found that they uses Generator Servant to ramp into Stormbreath Dragons and Underworld Cerberus. Here is a list by forum user Nintura.

Devotion Red w/ Black
Standard

Creatures: 26
4 Burning Tree Emissary
4 Eidolon of the Great Revel
4 Generator Servant
4 Boros Reckoner
4 Fanatic of Mogis
3 Stormbreath Dragon
3 Underworld Cerberus

Spells: 9
3 Dreadbore
3 Mizzium Mortars
2 Chandra, Pyromaster
1 Twinflame

Land: 25
4 Nykthos, Shrine to Nyx
4 Blood Crypt
4 Temple of Malice
2 Mana Confluence
1 Urborg, Tomb of Yawgmoth
10 Mountain

Sideboard: 15
3 Peak Eruption
3 Anger of the Gods
2 Rakdos’s Return
2 Doomblade
2 Ultimate Price
2 Hammer of Purphoros
1 Sire of Insanity

Underworld Cerberus is looking as a good threat in this deck as it is nearly unblockable and lets you return your guys from graveyard if its dies. In my version, I would add Scuttling Doom Engine as it can benefit on explosive Nykthos draws as early as turn 3 without worrying on colored mana cost.

Here is my current list:

Lands
4 Nykthos, Shrine to Nyx
4 Temple of Malice
11 Mountain
4 Blood Crypt
1 Mana Confluence

Creatures
2 Ash Zealot
4 Burning-Tree Emissary
4 Boros Reckoner
4 Stormbreath Dragon
4 Fanatic of Mogis
3 Generator Servant
2 Frostburn Weird
2 Scuttling Doom Engine
2 Purphoros, God of the Forge

Spells
2 Hammer of Purphoros
3 Mizzium Mortars
1 Chandra, Pyromaster
3 Dreadbore

This version does not necessarily rely on Generator Servant to ramp into the dragons and engine as it can curve out aggressively well while maintaining the devotion count. Following their list, I would cut Purphoros, God of the Forge for Underworld Cerberus or maybe a maindecked Sire of Insanity. That would be insane, no pun intended.

Nintura’s other version looks like this, which I would also like to test:

This Thursday and Friday will be my final playtest sessions so I’d better decide for a final list and just adjust the sideboard for the metagame.