Nightmare Lash 219 (Mirrodin)

Equipped creature gets +1/+1 for each Swamp you control. Equip—Pay 3 life. (Pay 3 life: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.)

NM - $3.90
LP - $3.10
MP - $2.40
HP - $1.60
DMG - $1.50