Super Naturon Shenron, Congregating Evil (BT18-027) - Dawn of the ZLegends Foil

[Permanent] If your Leader is a red “Shadow Dragon” card, reduce the energy cost of this card in your hand by 1.
[Auto] If your Leader is a “Shadow Dragon” card : When this card is played, look at up to 5 cards from the top of your deck, add up to 1 red “Shadow Dragon” card with an energy cost of 4 or less or 1 red Unison with a specified cost of 2 among them to your hand, then shuffle your deck.