Negative Energy Explosion

[Permanent] This card gains "Shadow Dragon" in all areas. [Activate:Main/Battle] [Limit 1] (You can only activate this skill once per turn across all copies of this card.) If your Leader Card is a "Shadow Dragon" card : Look at up to 7 cards from the top of your deck, then choose one— • Add up to 1 "Shadow Dragon" Extra Card among them to your hand, then shuffle you deck. • If you don't have a Unison Card in play, play up to 1 {Towa, Resonance of Shadow} among them with a marker on it, then shuffle your deck.