Repress Strike Dragon

/:When this unit attacks while boosted, 1, this unit, and if it is the fourth battle of this turn or more, this unit gets +10000 until end of turn. If this unit is on , choose a card from your hand, and discard 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.