Ultimate Minus Energy Power Ball

[Counter:Attack] If your Leader Card is mono-black : Choose up to 1 of your opponent's Battle Cards with 15000 power or less, ignoring [Barrier], and send it to its owner's Warp. [Permanent] This card gains "Shadow Dragon" in all areas. [Permanent] If you have a black Unison Card in play, you can activate this card's [Counter] skill from your hand without paying its energy cost. [Activate:Main/Battle] [Limit 1] Choose up to 1 of your black Leader Cards or Battle Cards, and it gets +15000 power until the end of a battle or the end of the turn, whichever comes first.