What structure deck should i buy?

Machina Mayhem, since Machina Gadgets are a tournament competitive deck. I hope this helps!

Check out this website, it will help with all things yu-gi-oh. I even have it so that you don't have to search for the page. However, I think it's a tie between Dragon's Roar and Machina Mayhem. Dragons are very powerful (just update it with some new dragon cards) while the machine deck comes with cyber dragon (a really good card) either way, you'll love them......or on that note, buy both of them. Hope I helped.

Machina Mayhem.

It has Gadgets, Cyber Dragon and powerful Machina monster that is easy to summon and revive.

And they're supported with good Spell and Trap Cards, such as Shrink or Dimensional Prison.

darkish Emperor, Zombie international ( the single with the purple eyes zombie dragon on it), or the warrior strike. darkish Emperor has alot of staple enjoying cards already in it, and has a reliable technique (i build an extremely reliable macro monarch from this shape). the zombie one is notably reliable too, particularly when you consider that mezuki is back at 2, so it a reliable start to a zombie deck. Warrior strike has an o.k. technique yet comes with alot of sensible staples like darkish bribe, and innovations administration.

machina mayham