Shadow Rider Calyrex VMAX

Ability — Underworld Door: Once during your turn, you may attach a Psychic Energy card from your hand to 1 of your Benched Psychic Pokémon. If you attached Energy to a Pokémon in this way, draw 2 cards.

Max Geist (10+): This attack does 30 more damage for each Psychic Energy attached to all of your Pokémon.