Piccolo, Master-Student Technique

[Auto] When this card is played, at the end of the turn, choose up to 1 of your opponent's Battle Cards or Unisons and it gets -20000 power for the turn. [Activate:Main] [Limit 1] If there are 4 or more colors among cards in your energy, Z-Energy, Battle Area, Drop, and Warp : Play up to 1 "Universe 7" "Son Gohan : Adolescence" card with an energy cost of 2 or less from under this card, and place this card under the played card.