X Booster Set 4: Rainbow Striker

"Rainbow Striker" is the 4th X Booster Set released in the Japanese format and English format.

Features

 * Contains 105 cards (3 BR/6 SP/8 RRR/12 RR/24 R/30 U/22 C) + ? Secrets
 * Includes further support for Dragon World, Dungeon World, Legend World, Star Dragon World, and others.
 * Each booster contains 5 random cards, one of them definitely R or greater, and also there may be a foil version of any R/U/C card.
 * One Secret Pack is guaranteed per box.