Blue Storm Dragon, Maelstrom (D-BT08/FFR09EN) [Minerva Rising]

[ACT](VC)[1/turn]:[COST][Discard a card from hand], choose a unit card with only "Aqua Force" for its clan or a "Tear Dragon" from your soul, call it to (RC), it gets"[AUTO](RC):When this unit attacks, if your opponent's vanguard is grade 3 or greater, and it is the first battle of this turn, [COST][Counter-Blast 1], and [Stand] this unit." until end of turn, and at the end of that turn, put it into your soul. [AUTO](VC):When this unit attacks a vanguard, if it is the fourth battle of this turn or more, draw a card, choose one of your opponent's rear-guards, and retire it.