New player question

Hi all ,

I am completely new to Yu-Gi-Oh. A couple of buddies and I are wanting to play but only with old cards. Once we get in the groove we will be playing GOAT format it looks like. I recently have been buying retro packs to outfit my collection along with battle cities and the Legendary Decks 2 box . I recently saw the LDD box at target and picked it up , but my question is, ae the decks in the Legendary Dragon Decks legal in goat?