Big Duel in the Blue Waters (蒼海の大決闘 Sōkai no Daikettō) is the fifth Extra Pack for the Z/X -Zillions of enemy X- TCG.
- The set's tagline is "It's summer! It's Z/X! It's Ignition!!" (夏だ！ゼクスだ！イグニッションだ！！)
- Not to be confused with the April Fools' Extra Pack, which also uses the same art piece and tagline.
- Similar to the first Extra Pack, this set only contains Rare or higher rarity cards.
- Includes reprints of popular Rare cards from Set 1 up to Set 6 with two reprints for each colors. All reprints also comes with new illustrations.
Each packs contain 4 cards and each boxes contain 10 packs. There are 30 cards in total (20 new cards and 10 reprints) + 30 holographic cards, excluding special cards.
- Rare: 25
- Super Rare: 5
- Hologram Rare: 30 (holographic version of all Rare and Super Rare)
- Each sealed packs comes with a Z/X Point.
- Each boxes comes with 5 card sleeves (initial production only).
- Official Product Page (Japanese)
|Extra Packs||Heroic Feast · Nippon Ichi Software · Kaiten Mutenmaru · Nippon Ichi Software 2 · Big Duel in the Blue Waters · Valkyrie Engage · Dragonic Order · Nippon Ichi Software 3 · Summer Dragon · All☆Z/Xstars · Bridal Dragon · E☆2 · Z/Xstage! · Azur Lane · Z/Xdream · Chibi☆Dragon · Summer Stage!! · Code reunion · Super! All☆Z/Xstars · Azur Lane 2 · Moe♡Dragon · Dream Stage!! · Z/Xmemo!|
|Character Packs||Rigel · Almotaher · Vesparose · Orichalcum Tyranno · Miko of the Beginning · Beginners' Pack|
|Booster Packs · Preconstructed Decks · Free Sets · Promotional · Card Gacha|