Naganadel-GX (SMA SV63)
This attack does 20 damage for each of your Ultra Beasts in play.
This attack's damage isn't affected by Weakness or Resistance.
Both players shuffle their Prize cards into their decks. Then, each player puts the top 3 cards of their deck face down as their Prize cards. (You can't use more than 1 GX attack in a game.)
When your Pokémon-GX is Knocked Out, your opponent takes 2 Prize cards.