monsters 20:
3x Red-eyes Darkness-metal-dragon
3x The White Stone of Legend
3x Blue-eye White Dragon
1x Prime Material Dragon
1x Masked Dragon
1x Debris Dragon
2x Red-eyes Wyvern
2x Totem Dragon
3x Dark Horus
1x DAD
spells 17:
3x Trade-in
3x Cards of Consonance
2x Smashing Ground
1x Card Destruction
1x Heavy Storm
1x MST
1x Brain Control
1x Future Fusion
1x Dragon's Mirror
1x Stamping Destruction
1x Hand Destruction
traps 3:
1x Return From Different Dimension
1x Trap Dustshoot
1x Royal Decree

extra deck:
2x Five-headed Dragon
2x Blue-eyes Ultimate Dragon
and synchros

Why only 1 Decree?

I'd use 2. And neg Hand Destruction for Allure of Darkness. The -1 from Hand can hurt.