You cannot play this card by itself. You must combine 2 different Legendary Trench from your hand to play as 1 Stadium card. Whenever any Pokémon (yours or your opponent's) is healed, double the amount of damage being healed.
This card stays in play when you play it. Discard this card if another Stadium card comes into play. If another card with the same name is in play, you can't play this card.