"Nubatama" (ぬばたま) is a clan from the nation of Dragon Empire. They are one of the Dragon Empire's espionage corps, with a focus on gathering intelligence. This clan has no known leader, although it does seem to be led by the "Congo" faction.
Nubatama is a control based clan that focuses on cutting down the opponent's resources, mainly the cards in their hand. The main way they do this is by bouncing an opponent's rear guard back to their hand then forcing the opponent to discard a card, which weakens their field and forces them to lose potential Shields. They can also directly force the opponent to discard a card which makes it harder for them to guard, in some cases they can limit how many cards the opponent can have at the end of the turn, forcing them to discard the rest.
Following its ninja-like aesthetics, Nubatama can also have a Hit-and-Run strategy by bouncing their own rear guards to the hand, which leaves less cards on the field for the opponent to target and allows them to superior call from the hand during the Battle Phase to do more attacks.
Nubatama has ProtectImaginary Gift, which allows them to stall the opponent while they continue to reduce the opponent's hand.