The spells and trap cards should cover for the weaknesses of your deck, and you should have a handful of each of the following: attack protection, effect negation, summon negation, spell/trap destruction
If you already have an idea of what you're looking for, you can buy singles online or at your local trading card store
Trap Normal When your opponent draws a card(s) by their own card effect: Look at those cards, and if any are monsters, inflict damage to your opponent equal to their combined ATK, and if you do that, banish all cards you looked at
Perfect Machine King costs 2 tributes to summon, which for a 2700 attack monster is already better than staples to the Yu-Gi-Oh series (like Dark Magician)
Once per turn, you can declare 1 card name: Excavate the top card of both player's Decks, and banish any cards among them with the declared name, or if neither card has the same name as the one declared, add 1 to your hand and shuffle the other into the Deck, also this card's ATK and DEF are doubled
Earl WAKE CUP