Oceanus Shenron, Negative Energy Explosion

Choose 1 card in your hand and discard it : Negate the attack and play this card. If you played a card, your opponent can't attack for the turn unless they place the top 4 cards of their deck in their Drop Area each time.
During your opponent's turn, reduce the energy cost of this card in your hand by 3.
If your Leader Card is a 《Shadow Dragon》 card : When this card is played from your hand or discarded by a 《Shadow Dragon》 card's skill, you may look at the top card of your deck; if it's a black 《Shadow Dragon》 card you may add it to your hand, otherwise, place it at the bottom of your deck.