As a general rule, its much easier to use a deck that has Pokmon which use no more than two different Energy types, or you may find it difficult to draw the right Energy to use in the game
Mismagius ex Another great ex card is Mismagius ex
Copying an instant or sorcery spell you cast this turn by simply tapping and not needing to invest extra mana is very powerful, and if you get to do it six times, youre likely well on your way to winning the game, even if you dont have more than twenty life
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Which starter deck is best depends on how familiar you are with YuGiOh's more recent changes
For extra security, you can place the top loader in a team bag to keep it from sliding out