Blue Storm Breaking Dragon, Engulf Maelstrom (G-BT13/S12EN) [Ultimate Stride]

[ Stride ]-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] Stride this card on your (VC) from face down. [CONT](VC) Wave-4th time only :For the battle that this unit attacked, your opponent cannot call cards from hand and G zone to (GC) with a grade less than the number of cards with "Maelstrom" in their card names in your soul. [ACT](VC)[1/Turn]:[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 [Power]+5000/[Critical]+1 until end of turn.