(Update-I: Major overhaul done for new plan.)
Hello everyone, how is it going? Although "Exodia, the Legendary Defender" isn't in Master Duel game, that didn't stop me theorycrafting. I know for sure it's in Legacy of the Duelist game, which is weird. Anyways, when this card comes into Master Duel, this is the deck I'm going to play. Let me explain the plan.
Gameplan
1) At one point, discard TLD and "Grace" with Ravenous. If possible, you can also discard "The World" with Dugares but it's not mandatory.
2) Place ME-PSY-YA on Pendulum Zone and Special Summon Black Luster Soldier with its ability to make sure "Primal Seed" loop is active. As long as you have banished TLD with BLS and not Grace/World by accident, everything will be fine.
3) Place "Light Barrier" and Special Summon The World, either with "Monster Reborn" if discarded by Dugares or via Saryuja and choose the outcome as heads to always skip your opponent's turn at the cost of two of your monsters being sent to GY.
4) Revive two bodies with "Monster Reborn" for The World. Then, activate "Lair of Darkness" to change attribute as DARK and set "DNA Surgery". If you have played "Into the Void" while having Ni-Ni in-hand, end your turn and use The World to skip your opponent's turn.
5) It's your turn now. Revive 2 x Level 4 monsters with "Monster Reborn" and overlay into "Abyss Dweller". Activate Dweller to not be disturbed by your opponent's GY. Reason is that you have to revive Grace with "Monster Reborn" and let your opponent send a monster to GY by force.
6) Repeat #5, which is possible by destroying Grace with Offerings and reviving with Reborn, until you find an appropriate monster which can be revived with "Mikanko Fire Dance". The aim is to not tackle it with Ni-Ni but to revive a monster as negated to opposing side, which is why "Mikanko Fire Dance" is the perfect choice. Then, activate "DNA Surgery" and choose FIEND as Type.
7) All that is left is filling your board with "Monster Reborn" and fetching TLD via "Primal Seed" loop. Tribute any 5 monsters to your preference and attack the monster to win!
Well, that's all for this one. Do you like that? Let me know if you have better ideas because I would love to improve this deck. Have fun in YuGiOh!