Whirlwind Spin

[Permanent][Opponent's Turn] When you would pay the cost of this card in your hand, you may discard 1 card with 《Shadow Dragon》 in its special traits other than this card from your hand instead. [Activate Battle] Your card that's in a battle gets +20000 power for the battle. Then, choose all Battle Cards with costs of 1 or less in your opponent's Battle Area and place them at the bottom of their owner's deck.