Shame that we dont get to see the other duels to figure out which other 5 decks were used but this duel was pretty good anyways, despite the missplays.
Well, we know from chapter 24 that Shoma brings total 6 decks (tenyis, virtual world, amazement, ursarctic, starry knight and magikey)
tenyis, virtual world, amazement are all used once and still no new sp till this chapter, so the author might think that no need to show them again and conclude the whole tournament with just 3 remaining decks