Here's the update for Red-eyes Darkness Metal Dragon effect "once per turn"
In hand: Absorouter Dragon + Quick Launch + White Dragon Wyverburster.
- Activate Quick Launch --> special summon Rokket Tracer --> special summom Absorouter --> link them into Crystron Halqifibrax --> Absorouter eff: add Rokket Synchron to your hand -> Crystron eff: special summon another Rokket Synchron --> normal summon Rokket Synchron to special summon back Absorouter.
- Link 2 Synchron into Guardragon Elpy - Pisty so that they point to each other --> Pisty eff: special summon back any lv 4 in you GY --> Link Absorouter, Synchron and Crystron into Unchained Abomination --> Elpy eff: special summon Black Metal Dragon --> link it into Striker Dragon --> Black Metal eff: add Red-eyes Darkness Metal Dragon to your hand --> banish Elpy to special summon Darkness Metal --> activate Boot Sector Lanch -> special summon Tracer --> special summon White Dragon by banishing Black Metal --> link Pisty and White Dragon into Dragunity Knight - Romulus -> add Dragon Ravine -> add Black Dragon --> special summon Black Dragon by banishing White Dragon.
- Tracer eff: destroy Boot Sector to special summon any lv 4 rokket --> synchro summon Draco Berserker of The Tenyi by using Tracer and Black Dragon -> Black Dragon eff: add the 2nd White Dragon --> Darkness Metal Dragon eff: special summon back Tracer --> synchro Tracer and the other rokket into Borreload Salavage Dragon -> Salvage eff: equip Cryston to it.
End board: Unchained Abomination; Red-eyes Darkness Metal Dragon; Draco Berserker of The Tenyi; Borreload Salvage Dragon (2 counter) ; Dragunity Kinight
- Romulus. What in hand: White Dragon; Dragon Ravine; 2 random cards.
(or if you want to get rid of Romulus: .....2nd White Dragon --> link Romulus and the other rokket into Quadborrel Dragon --> Quadborrel eff: discard 1 random card to destroy itself -> special summon back Tracer and 1 lv 4 rokket --> synchro them into Borreload Salvage Dragon -> Salvage eff: equip Crystron to it. Further step if you have Number 38: .....equip Crystron to it --> activate Dragon Ravine -> discard 1 random card to send Galactic Spiral Dragon to GY --> Darkness Metal eff: special summon Tracer in the GY --> special summon Galactic Spiral --> Galactic eff: turn everything to lv 8 --> overlay Tracer and Galactic into Number 38. End board: Unchained Abomination; Red-eyes Darkness Metal Dragon; Draco Berserker of The Tenyi; Borreload Salvage Dragon (2 counters); Number 38. What remain on hand: White Dragon Wyverburster. Total: 3 nagates.)