Ultimate Dark Dragon-Slaying Bullet (Revision) (BT14-140) - 5th Anniversary Set

[Counter:Play] You can activate this skill if your opponent declares they’re playing a Unison Card. They may either remove a marker from the Unison Card for every 2 cards in their Drop Area and Warp, or place it in their Drop Area instead of playing it. If they don't, your opponent can only attack one more time for the turn.
[Permanent] This card gains "Shadow Dragon" in all areas.
[Activate:Main/Battle] [Limit 1] Your opponent choses 1 of their Battle Cards with an energy cost less than the number of cards in their Drop Area and sends it to its owner's Warp.