[Auto]<Valid> Square <Trigger> You draw a card. <Effect> You may put up to 2 [Metal Fortress] in your Trash face-up under this card as Force. (If you draw 2 cards at once, put a total of 4 as Force.) [Boot]<Valid> Square <Cost><Effect> If there are 8 or more [Metal Fortress] as this card's Force, return all of your opponent's Z/X on Normal Square to deck, and shuffle the deck. This ability can only be played once per turn.