My two main decks for this playthrough, for anyone curious.
OTK
- Mechanicalchaser x3
- Blast Sphere (Replace with Black Luster Soldier - Envoy of the Beginning in postgame!)
- Blowback Dragon x2
- Cyber Dragon x3
- Gear Golem the Moving Fortress x3
- Jinzo
- Reflect Bounder x3
- The Light - Hex Sealed Fusion x2
- Future Fusion
- Giant Trunade
- Graceful Charity
- Heavy Storm
- Limiter Removal
- Magical Mallet x2
- Mystical Space Typhoon
- Nobleman of Crossout
- Overload Fusion x2
- Sealed Gold Coffer x3
- Swords of Revealing Light
- Call of the Haunted
- Dust Storm x2
- Magic Cylinder
- Mirror Force
- Ring of Destruction
- Torrential Tribute
- Cyber Twin Dragon x2
- Cyber End Dragon x2
- Chimeratech Overdragon x2
Crapxodia
- Left Arm of the Forbidden One
- Left Leg of the Forbidden One
- Right Arm of the Forbidden One
- Right Leg of the Forbidden One
- Exodia the Forbidden One
- Magician of Faith
- Manticore of Darkness
- Marshmallon
- Nimble Momonga x3
- Skelengel x1 (Replace with Pot of Greed in the postgame!)
- Spirit Reaper x1
- Thunder Dragon x3
- Card of Safe Return x3
- Foolish Burial x3
- Graceful Charity
- Heavy Storm
- Magic Mallet x2
- Mystical Space Typhoon
- Pot of Avarice
- Sealed Gold Coffer x3
- Upstart Goblin x2
- Jar of Greed x3
- Mirror Force
- Torrential Tribute
- Wall of Revealing Light
This also unlocks the post-game mode where virtually every duelist from the game becomes available for matches, and many older ones you've encountered are now sporting multiple/new decks (some of which are more than a match for the ones I've been using). Give 'em a go!