No, they are not required in a deck to meet the rules, though you will have a hard time without them unless your deck focuses on spell negation.
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there is no top 10 yugioh cards. its about how you use them, but if you could name a specific type of yugioh cards like dragons machines etc.. then i could be of more help
you cant
They wanted to show off newer cards.
You have to 2 memory cards, which decks already configured, then select 2 player mode, pick your stage or if you have a premade stage you can use that, selet whether or not you want the players cards to be showing and then your good to do
I'm assuming here that you are running a Dark World deck, if i am wrong, this advice might not be accurate. Something that i run in my Dark Worlds' is The Cheerful Coffin. It is a normal spell card that lets you discard up to 3 monsters from your hand. Another card would be Card Destruction, giving you an opportunity to use the effects of your Dark Worlds', and draw more cards. Some cards used to remove cards from play are Macro Cosmos, Dimensional Fissure, and Big Burn. I'm assuming here that you are running a Dark World deck, if i am wrong, this advice might not be accurate. Something that i run in my Dark Worlds' is The Cheerful Coffin. It is a normal spell card that lets you discard up to 3 monsters from your hand. Another card would be Card Destruction, giving you an opportunity to use the effects of your Dark Worlds', and draw more cards. Some cards used to remove cards from play are Macro Cosmos, Dimensional Fissure, and Big Burn.