Holon Researcher (Delta Species 95/113)

Rules

You can play only one Supporter card each turn. When you play this card, put it next to your Active Pokémon. When your turn ends, discard this card.

Discard a card from your hand. If you can't discard a card from your hand, you can't play this card.

Search your deck for a Metal Energy card or a Basic Pokémon (or Evolution card) that has δ on its card, show it to your opponent, and put it into your hand. Shuffle your deck afterward.