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 - $15.70
LP - $12.60
MP - $9.50
HP - $6.30
DMG - $3.20