Darkness Energy - 96/115 EX Unseen Forces Expansion Stamp Holo

If the Pokémon Darkness Energy is attached to attacks, the attack does 10 more damage to the Active Pokémon (before applying Weakness and Resistance). Ignore this effect unless the Attacking Pokémon is Darkness or has Dark in its name. Darkness Energy provides Darkness Energy. (Doesn't count as a basic Energy card.)
Rare
Illustrated by Milky Isobe
From the Pokemon Card Game set EX Unseen Forces