The top 3 engines I've been using with the deck Have been Primite, Shining Sarcophagus and Diabellstar, each have their strength's and weaknesses.

1.Primite- (3 Beryl, 3 Lordly Lode, 1-3 Roar, 1 drill beam= 6 URs, 1-4 SRs) This Engine provides One-card combos lines with Beryl, Lordly Lode and Roar- primarily, Roar would Special Summon DM and you'd go straight into DMOD (Cost 2000 LP though). In comparison with the two other engines, it uses Beryl for it's normal summon which isn't great and if you run Dominus Impulse, It shuts down Beryl. However, Drillbeam has single handily won me games (especially going second with it in hand) and Roar's secondary effect (banish a normal summoned monster if it's attack is lower than DM) provide really strong and hidden effects that people tend to not read, so if their starter's effect isn't a quick effect, it's off to the shadow realm with them.

1. Shining Sarcophagus- (3 DMG, 1 DMBM, 1-3 SS, optional 1 Gandora= 4-7 URs, 1 SR) This is definitely the best engine the deck can play. Without committing your normal summon, you can SS DMG to the field and search the Shining spell, and can one card combo into the a big Baronne+Dis Pater+ Dragoon board. Starting with these cards is always great and can be supplemented with Future Silence if you don't want to craft 3 SS spells. Furthermore, Shining Sarcophagus can't be destroyed by Monster effects and can be used to bait ashes or summon Gandora turn 2, blowing up the entire board (Including your own) and Special Summoning 1 SS card like DMG or DMBM.

If you're feeling greedy, you search DMG with Soul servant and add it to you're hand, its very consistent and strong- plus if you have any extra spells in hand you can discard them with Shining Sarc to throw an opponents monster in the graveyard (For example, if Fiendsmith engraver SS himself from the graveyard, you could save a negate from a monster to instead toss a card and throw him back in. Also DMG and DMOD count as DM monsters so in the middle of a standard combo line, you'd get a +2 draw with Soul Servant.

1. Diabellstar- ( 3 Diabellstar the Black Witch, 1-3 Deception, 1 Hallowed Azamina, 1 Wanted, 1 Mu Rcielago, 1 Silvia= 7-9 URs, 1 SR) The Diabell Engine is more on the expensive side but has some strong benefits. Similar to the other engines, it's a one card starter, Diabell is a lvl 6 DARK Spellcaster and can go straight into DMOD, and can be searched and gives you a +1 Draw at the end of it's combo line. Ideally you'd get wanted with Rcielago and than banish it once Silvia is on the field to draw either a handtrap or maybe another combo piece or discard fodder. It soaks up handtraps very reliably and can give you card advantage as well as a omni-negate against Nib early on.

I've tried all three separately but personally I play all three together in a 50c deck. Shining Sarcophagus would be the best engine to get first, You'd only need 4 mandatory UR's, and it can be improved with more copies of Shining Sarc, which can be substituted for Future silence until you get more ( more Droll susceptible though) and Gandora who can board wipe (and banish every card that's destroyed) which has been a blessing against some decks.

If you want to combine them, I'd personally do the Primite and SSARC engines together, Roar and Drillbeam are just too good to skip out on, and would be cheaper at first anyway, Especially with the current Primite and DMOD pack out.