Mega Rayquaza ex

Once during your turn, when you play this card from your hand onto your Bench, you may look at the top 4 cards of your deck, choose a Basic Energy card you find there, and attach it to this Pokémon. Shuffle the other cards face down and put them on the bottom of your deck.

This attack does 50 damage for each Fire Energy and Lightning Energy attached to all of your Pokémon.