HAT Format, arguably the most diverse format in Yugioh history, lasted from the release of Primal Origin in May 2014 to the release of Duelist Alliance in August 2014. Over 10 distinct decks were considered meta during this time, including Sylvans, Geargia, Lightsworn Ruler, and of course the titular HAT.

What was it that caused HAT to be such a diverse format? Through an in-depth analysis of each period of the format, I intend to try to answer this question, while studying the development of the format along the way. This article will look at the Early HAT period from the release of Primal Origin to Structure Deck: Realm of Light.

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