Blowing Up Yosen

Select 1 "Yosen Training Grounds" you control and place Yosen Counter(s) on it equal to the number of "Yosenju" monsters on your field. This Skill can only be used once per Duel. In addition, add a Pendulum Zone to your field if you began the Duel with a Deck that has 9 or more "Yosenju" monsters. (Extra Deck does not count.)