Battle Spirits Saga: Booster Inverted World Chronicle - Strangers in the Sky (BSS05)A New Chapter Begins: Inverted World Chronicle! First appearance of double color cards and new keyword effect Astral! BSS05 marks the introduction of double color cards! In this set, there are spirit, magic, and nexus cards of six color combinations: red purple, purple yellow, yellow white, white green, green blue, and blue red. Many of the double color cards feature a new keyword effect, Chain, making it easy to construct multicolor decks and