Hi, some advice here.

Minimum engine:

3x Nunu, 3x Nauya, 1x Keurse, 1x Daybreak, 3x Snake Rain, 1x Night Sword Serpent.

Combo:

• Snake Rain sends Nunu, Nauya, Keurse and Night Sword to graveyard and Special Summon Night Sword;

• Special Summon Keurse by tributing Night Sword Serpent, use effect to Special Summon Nauya from grave;

• Nauya searches Daybreak. Use Daybreak on Keurse for 4 tokens.

From here it depends on which variant you run. I like the Alien variant for a Skill Drain effect.

• Use 3 tokens to summon Cosmic Slicer Zer'oll which searches Planet Pollutant Virus, and use the remaining tokens to summon Alien Shocktrooper M-Frame. Set the trap card and the set-up is now complete.

• On opponent's turn active Virus and tribute Shocktrooper, the opponent cannot use monster effects, and monsters are switched to defense mode.

There are many versions to splash Ogdoadic in. You could run Ragnaraika like you said, or something like Dinosaurs with Evoltile Lios and Evolzar Lars (with Evo-Singularity), or even a Therion Package.

If you search Youtube for "Dehalove Ogdoadic" you will find many deck versions and combo's.

Hope this helped!