User blog comment:Dm geovanie/"Disgard" Legend World Deck/@comment-24965906-20150515202329/@comment-6102960-20150518195710

Here we have someone who doesn't understand the best of 3 match format.

All fights are played in rounds of 3. Inbetween the 1st and 2nd fight, and the 2nd and 3rd, you can switch up your deck to better your chances against spesific opponents. This is most prominent in Yugioh, where you can have a anti-xyz card in the side deck that you switch into your deck to better your chancesagainst xyz-based decks.