*YOU CAN USE ANY EXTRA DECK, it is used only to draw cards by banishing them using Pot of Extravagance.
Draw of Fate is the most important spell card in this deck. To use it you need Life Points lower than your opponent: from taking battle damage, via Solemn Judgment or Upstart Goblin and you can only activate one card / effect afterwards, so make sure you have used any other spells beforehand. You can then use it to put Exodia / Forbidden One Pieces on top of your deck along with cards to help you draw them. You also need to consider that if you retrieve a card from the deck e.g. via Sangan then you will need to shuffle the deck, losing the cards you placed on top. Sangan is also a good card to add on top because it is a blocker that can be used to automatically add any Exodia / Forbidden One piece to your hand. If you only need one Exodia / Forbidden One card then you can guarentee that you draw it by adding the piece, Pot of Duality and Pot of Extravagance to the top because no matter what you draw you can use your last spell activation to draw the Exodia / Forbidden One piece.
Hand Destruction can be used to send 2 pieces of The Forbidden One in your hand to the Graveyard, allowing you to draw 2 cards, then they can be retrieved with Dark Factory of Mass Production.
You can also use Dark Factory of Mass Production to retrieve pieces of The Forbidden One in the Graveyard that were put there via Obliterate!!! In a pinch you can even use Solemn Judgment to cancel the activation of Obliterate!!! and send it to the Graveyard, allowing you to retrieve one Exoida / Forbidden One piece.