Darkness Energy - 158/165 - Expedition Base Set x-men this attack does 50 damage

this attack does 50 damage plus 10 more damage for each Energy you returned

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You can't add more then 20 damage in this way

put 4 damage counters on the Defending Pokémon

Darkness Energy - 158/165 - Expedition Base Set x-men this attack does 50 damageCard Type: Energy Stage: Special Rules: If the Pokmon Darkness Energy is attached to does damage with an attack (after applying Weakness and Resistance), the attack does 10 more damage. At the end of every turn, put 1 damage counter on the Pokmon Darkness Energy is attached to, unless it's Darkness or has Dark in its name. Darkness Energy provides Darkness Energy. (Doesn't count as a basic Energy card.)