Sword Dance of the Demon God

Negate the attack, then add up to 1 skill-less Battle Card from your Drop Area or Warp to your hand.
(You must remove a marker from your Unison Card to activate this skill.) (You can only activate this skill once per turn across all copies of this card.) , Unison Card with a specified cost, remove this card in your Drop Area from the game : Choose up to 1 of your opponent's Battle Cards with an energy cost of 4 or less and send it to its owner's Warp.