Whenever you attach a Energy card to Entei from your hand, you must discard 1 other Energy card attached to Entei. (If you can't discard Energy cards, you can't attach the Energy card.)
Attack: Burning Fang
Damage: 40
You may flip a coin. If heads, the Defending Pokémon is now Burned and you discard 1 Energy card attached to Entei.