Diva of Waterheart, Petronille D-LBT04/020 RR

[AUTO]:When this unit is placed on (RC), COST [Counter Blast (1)], look at the top seven cards of your deck, choose up to one card with "PRISM" in its card name from among them, reveal it and put it into hand, and shuffle the deck. If you did not reveal a card, you may Soul Charge (2). [AUTO](RC):At the end of the battle this unit attacked, if you have a vanguard with "Labrador" in its card name, you may return this unit to hand.