These are the archetype support cards available for the Bujin archetype. Bujin Regalia - The Mirror can stop your opponent from activating Spell/Trap cards and their effects until the end of their next turn after this card was activated. Bujin Regalia - The Sword has 2 kinds of effects to choose from, 1 is bring back 1 “Bujin” monster from your Graveyard to your hand, 1 is bring back 1 “Bujin” monster from your banished zone to your Graveyard.
The bujin archetype is a defend the castle deck where you try to get to yamato as fast as possible. In the actual card game, we had three cards that would allow is strategy to work. Bujin hare prevents Yamato from being destroyed by card effects. Bujin turtle prevents targeting. Then finally, bujin crane doubles Yamato's original attack points. Bujins also have other support cards and xyz monsters attached to them for slight field presence or xyz spam. Most Like we will not see the xyz for some time but I'm hoping we will at least receive crane for support as the deck is not meta ready.