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Buddyfight X CoroCoro Deck
This set was released on March 15th, 2017 in English.
The Buddyfight X CoroCoro deck is a Japanese exclusive Start Deck that will be included in the April edition of the CoroCoro Magazine. It will be based around the new "Thunder Empire" attribute for Dragon World.
As for English release of the cards within, past CoroCoro Decks have released the majority of the cards within in the deck's Start Deck or in the season's 1st set, but do keep in mind that this is unconfirmed for this deck at this time.