Advanced format ruling
Breakthrough!
Card effect (current official text)Select 1 "Six Samurai" monster you control. If the selected monster destroys an opponent's monster by battle, "Great Shogun Shien" and all "Six Samurai" monsters you control can attack your opponent directly during the Battle Phase of this turn.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.