You can only use each effect of "Duke Shade, the Sinister Shadow Lord" once per turn

1 Vennominaga the Deity of Poisonous Snakes 2 Vennominon the King of Poisonous Snakes 2 Yamoimori 1 Ogdoabyss, Deity of the Abhyss 2 Curse, Dawn of the Abhyss 1 Amunesia, Queen of the Abhyss 3 Null, Dreg of the Abhyss 3 Nihil, Dreg of the Abhyss 2 Zoha, Haze of the Abhyss 2 Phlogi, Haze of the Abhyss 1 Aleth, Dusk of the Abhyss 1 Aron, King of the Abhyss 3 Snake Rain 3 Snake Lily of the Abhyss 1 Depths of the Abhyss 1 Foolish Burial 1 Monster Reborn 3 Rise of the Snake Deity 2 Trap Trick 3 Offering to the Snake Deity 1 Invasion of the Abhyss 1 Call of the Haunted 2 Back to the Front 2 Alien Shocktrooper M-Frame 1 Reptilianne Echidna 2 King of the Feral Imps 1 Dingirsu, the Orcust of the Evening Star 1 Galaxy-Eyes Cipher Dragon 1 Galaxy-Eyes Full Armor Photon Dragon 1 Galaxy-Eyes Cipher Blade Dragon 1 Diamond Dire Wolf 1 Knightmare Cerberus 1 Knightmare Unicorn 1 I:P Masquerena 1 Number 38: Hope Harbinger Dragon Titanic Galaxy 1 Tornado Dragon March 10th is Cactus Day
Messenger of Peace
Its also a great stall tactic while you continually put your Ghostricks in face down after activating their effects
You can XYZ summon this card in 2 ways: You can either overlay two level 12 monsters (and lets be real, who on Earth would do that?!) or you can simply have an XYZ monster battle