Syn Shenron, Strongest Negative Energy

[Auto] When a player attacks, you may use 1 "Shadow Dragon" card from under a Z-Extra in your Battle Area in a combo with its skills negated for the turn. If you do, negate this skill for the turn. [+1] [Activate:Main] Place 1 yellow Shadow Dragon card from your hand under "7 Shadow Dragons Assembled" in your Battle Area : Draw 1 card, and this card gets +5000 power until the end of your opponent's turn.