Blue Storm Helical Dragon, Disaster Maelstrom (G-BT09/S08EN)

[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. [AUTO](VC): [Choose a face down card named "Blue Storm Return Dragon, Disaster Maelstrom" from your G zone, and turn it face up] When this unit attacks, if you have a heart card with "Maelstrom" in its card name, you may pay the cost. If you do, search your deck for up to one card with "Maelstrom" in its card name, reveal it, put it into your hand, shuffle your deck, and if you have a card in your soul with "Maelstrom" in its card name, choose up to three units in your front row, and they get [Power]+5000 until end of turn.