You can pay 1000 LP, then target 1 face-up Spell/Trap Card on the field; destroy it. You can only activate this effect of "Unending Nightmare" once per Chain.
Near Mint / Lightly Played Unlimited - $6.00
Moderately Played Unlimited - $5.50
Heavily Played Unlimited - $4.50
Damaged Unlimited - $3.50
Near Mint / Lightly Played 1st Edition - $5.50
Moderately Played 1st Edition - $5.00
Heavily Played 1st Edition - $4.00
Damaged 1st Edition - $3.50