Stealth Dragon, Seiengeki

/:When this unit attacks while boosted, 1, if your opponent's hand has four or more cards, your opponent chooses a card from their hand, and discards it. (Hand):At the beginning of your ride phase, if your vanguard is grade 1 or less, [discard this card], look at the top five cards of your deck, choose up to one grade 2 or less card from among them, reveal it and put it into your hand, and shuffle your deck.