Syn Shenron, Power of Darkness

, if your Leader Card is a black 《Shadow Dragon》 card : When you remove a marker from one of your Unison Cards using a skill, play this card from your hand, and your opponent places the top card of their deck in their Drop Area.
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.