Blue Storm Breaking Dragon, Engulf Maelstrom

-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] this card on your from face down. Wave-4th time only:Your opponent cannot call cards from his or her hand or G zone to with grade less than the number of cards with "Maelstrom" in their card names in your soul during the battle that this unit attacked. :［Choose a face down card from your G zone, and turn it face up］ If the number of face up cards with "Maelstrom" in their card names in your G zone is two or more, this unit gets +5000/ +1 until end of turn.