Knight of Piercing, Cadwalla

[AUTO](RC):At the end of the battle this unit attacked a vanguard, if you have four or more units, [COST][Soul-Blast 1 & retire this unit], look at the top three cards of your deck, choose up to one grade 2 or greater unit card from among them, reveal it and put it into hand, and shuffle the deck. If you did not reveal a card, draw a card.