Majin Buu, the Shadow Warrior

When this card is played, look at up to 7 cards from the top of your deck, play up to 1 〈Dark Broly〉 card with an energy cost of 9 or less or up to 1 non-black Battle Card with 〈Xeno〉 in its character name and an energy cost of 9 or less among them, then shuffle your deck.
If this card is in Rest Mode : When your opponent attacks a Leader Card, they choose 2 cards in their hand and discard them.