"Climax Boosters" (クライマックスブースター Kuraimakkusu Būsutā) are packs of cards that are used to build or edit decks with new cards, but are separate from the standard Booster Sets.
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D-CBT Japanese advertisement
X-CBT01&CBT02's Japanese advertisement
S-CBT01&CBT02's Japanese advertisement
S-CBT03's Japanese advertisement