My final attempt at making the best Forbidden Memories Deck without cheats:
3x Meteor B. Dragon
3x Blue-Eyes White Dragon
3x Skull Knight
3x Bright Castle
3x Dragon Treasure
3x Dark Energy
3x Malevolent Nuzzler
3x Violet Crystal
1x Dark Hole
3x Widespread Ruin
The primary attackers of this Deck are Meteor B. Dragon and Blue-Eyes White Dragon, both of which have the Sun to counter the Moon of Gate Guardian. Metalzoa, Skull Knight, and Zoa are secondary attackers. Skull Knight and Zoa are very important since it has Mercury to counter the Sun of Blue-Eyes Ultimate Dragon.
The Equip Spells exist to power up the two “classes” of monster in this Deck: bright fiery dragons and brutish creatures of darkness. All three of my weaker monsters (Metalzoa, Skull Knight, Zoa) can be powered up by the same Equip Spells. Meteor B. Dragon and Blue-Eyes White Dragon don’t have as many options but they don’t need as many Equip Spells to become strong enough to challenge a Blue-Eyes Ultimate Dragon.
Widespread Ruin has many uses. It is a good first move to buy you some time. You can protect yourself later in the game from a Blue-Eyes Ultimate Dragon or Gate Guardian in the event your opponent draws them. By having only 15 monsters, I trim my Deck of redundant monsters and enjoy Widespread Ruin while being consistent.
Raigeki is staple while Dark Hole can also get rid of your opponent’s back row.