Atraffic Control, Bottomless trap hole, Skauretsu armor, Aqua Jet(if you have some aqua or sea serpents), Monster Reborn
I would recommend 20 Spell and Trap Cards, and 20 monster cards, or if not, you can have any amount of Spell Cards, as long as there are 40 or under, because 40 cards are the number of an official deck
Giant trunade. It is a spell or a magic that will return all spell and trap cards or all the magic or trap cards on the field
I would then suggest a normal monster strike deck. This deck uses normal moster and equip spell cards with other spell and trap cards to boost your monster strength. It has cards like "Sword of the Soul-Eater", "Sogen", and "Collected Power".
No, there is no rule that says you must have any monsters at all in your deck. You can make it 100% Spell and Trap cards if you wish.
for a standard deck 50% Monster 25% Spell 25% Trap for a life shaver deck 60% Spell 10% Trap 30% Effect monsters for a beatdown deck 60% High ATK monsters 10% Trap 30% Spell and I recommend keeping to 40 cards but don't go to a point where you are LOOKING for cards to put in your deck.
it depends what cards are in the spell/trap section of the deck. it also depends on your style of play
There is a card called "A feather of the phoenix" that if you discard 1 card from your hand you can return a card from your graveyard to the top of your deck. So you can pick any card in your graveyard including a spell or trap card.
Quick-play Spell cards are Spell Speed 2, so are the same speed as all Trap cards except for Counter Trap cards which are Spell Speed 3.
A best yugioh deck would be a deck that eliminates your opponents options. like a deck with jinzo and horus, the black flame dragon LV 8 both can stop your opponents spell and trap cards. also a deck with cards like needle worm can discard your opponents deck so when they have no cards left you win.
Yes.
For this answer Ill only put the names of the cards i remember the most, to know all of the cards in Jaden's deck you can look it up on Wiki or a fansite Spell cards (eg Emergancy Provisions), Trap Cards (Hero Signal), and Monster cards (Elemental Hero Neos)
up to 20 and the rest are magic and trap cards