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 - $10.00
Lightly Played - $9.00
Moderately Played - $7.50
Heavily Played - $5.00
Damaged - $1.00
Near Mint Reverse Holofoil - $80.00
Lightly Played Reverse Holofoil - $72.00
Moderately Played Reverse Holofoil - $60.00
Heavily Played Reverse Holofoil - $40.00
Damaged Reverse Holofoil - $8.00