This popular retro Yugioh format is named after Hands/Artifacts/Traptrix, a popular deck. In this format, we saw trap-heavy decks coming back to the game. Info on the format is on FormatLibrary. There’s a HATFormat site too.
Here’s an overview of the winning decklists of a recent tournament:
Here are tournament topping decks you can download, put into duelingbook and use a baseline: