Konami offers three basic Deck Recipes for Ancient Guardians.
A Deck that Tributes your own monsters to call forth your ace Level 8 and 10 monsters from the depths of your cold Graveyard.
3 Null, Dreg of the Abhyss
3 Nihi, Dreg of the Abhyss
2 Phlogi, Haze of the Abhyss
3 Zoha, Haze of the Abhyss
3 Curse, Dawn of the Abhyss
1 Aleth, Dusk of the Abhyss
2 Aron, King of the Abhyss
2 Amunesia, Queen of the Abhyss
2 Ogdoabyss, Deity of the Abhyss
3 Snake Lily of the Abhyss
2 Depths of the Abhyss
3 Snake Rain
1 Foolish Burial
2 Pot of Prosperity
1 Monster Reborn
1 Harpie’s Feather Duster
1 Emptiness of the Abhyss
2 Invasion of the Abhyss
3 Offering to the Snake Deity
3 King of the Feral Imps
3 Alien Shocktrooper M-Frame
3 Reptilianne Echidna
Also, consider adding Rank 4 or 8 Xyz Monsters, as well as useful Link Monsters to your Extra Deck.
A Deck of various melodies that with “Doremichord” who manipulate Even and Odd Scales. Befitting a musical triad, their Spells and Traps tend to have three effects that all support expanding your field!
By altering your Pendulum Scale to change the ‘tune’ (i.e. Effects), you can assemble everything centered around “Dodoremichord Coolea”
3 Dodoremichord Cutea
2 Redoremichord Dreamea
2 Midoriremichord Elitea
3 Fadoremichord Fancea
3 Sodoremichord Gracea
3 Ladoremichord Angelea
3 Sidoremichord Beautea
3 Dodoremichord Coolea
3 Doremichord Elegance
2 Doremichord Scale
3 Doremichord Harmonia
3 Wavering Eyes
1 One for One
1 Harpie’s Feather Duster
1 Raigeki
2 Doremichord Musica
2 Doremichord Formal
1 Heavymetalfoes Electrumite
Your Extra Deck should include whatever cards you like, including useful Link Monsters.
A Unique Deck with unusual plays in the form of calling forth Synchro Monsters based on the difference between Levels.
Call a Level 1 Synchro Monster with a Level 7 monster and a Level 8 Tuner, and then bring out another Level 8 Tuner to follow up with your ace Level 7 Synchro Monsters.
3 Ursarctic Micpola
3 Ursarctic Mictanus
3 Ursarctic Micbilis
3 Ursarctic Megapola
3 Ursarctic Megatanus
3 Ursarctic Megabilis
3 Crystal Girl
1 Alpha, the Master of Beasts
3 Ursarctic Departure
2 Ursarctic Slider
3 Ursartctic Big Dipper
2 Ayers Rock Sunrise
1 Foolish Burial
3 Pot of Prosperity
1 Monster Reborn
1 Harpie’s Feather Duster
3 Ursarctic Quint Charge
3 Ursarctic Polari
3 Ursarctic Septentrion
3 Ursarctic Grand Chariot
Include whatever cards you want to the Extra Deck but we do recommend Level 9 Synchro Monsters.