If the Pokemon 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 Pokemon Darkness Energy is attached to, unless it's D or has Dark in its name. Darkness Energy provides D Energy. (Doesn't count as a basic Energy card.)
Near Mint - $4.90
Near Mint Reverse Holofoil - $15.00
Lightly Played - $4.65
Lightly Played Reverse Holofoil - $14.25
Moderately Played - $4.20
Moderately Played Reverse Holofoil - $12.75
Heavily Played - $3.70
Heavily Played Reverse Holofoil - $11.25
Damaged - $3.45
Damaged Reverse Holofoil - $10.50