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 - $4.40
Near Mint Reverse Holofoil - $8.80
Lightly Played - $4.10
Lightly Played Reverse Holofoil - $8.30
Moderately Played - $3.70
Moderately Played Reverse Holofoil - $7.50
Heavily Played - $3.30
Heavily Played Reverse Holofoil - $6.60
Damaged - $3.10
Damaged Reverse Holofoil - $6.20