Onslaught Surf Dragon

:When this unit is placed on , choose a grade 3 card with "Maelstrom" in its card name from your ride deck, and you may reveal it. If you revealed a card, or you have a grade 3 or greater vanguard with "Maelstrom" in its card name, 1, look at the top seven cards of your deck, choose up to one Blue Storm Armada card and up to one unit card with only Aqua Force for its clan or a Tear Dragon with a different card name from this unit from among them, reveal them and put them into hand, and shuffle the deck. :When this unit attacks, if you have a grade 3 or greater vanguard with "Maelstrom" in its card name, this unit gets +5000 until end of turn. Then, if it is the fourth battle of this turn or more, and no drive checks were performed for the battle your rear-guard attacked this turn, [put a card from hand into soul], and this unit performs drive checks until end of that battle.