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Bible Guide Book an extremely scarce item

Put a +1/+1 counter on each creature you control whose name begins with either of the chosen letters

Their key Extra Deck monster however is "Swordsoul Grandmaster - Chixiao", an Extra Deck searcher able to search or banish any "Swordsoul" card from the Deck when summoned (who also has its own negation disruption effect), which enables further extension by searching for more "Swordsoul" starters or banishing a Trap to make a "Swordsoul Token", or to further strengthen the end board by searching a "Blackout" or "Emergence" (for it to search a generic Wyrm boss monster, like "Archnemeses Protos")

Do note that the Nightshade Assassin requires a different, more control, deck to function

~Psychic pokepalace