Basilisk Collar MM3-216/5075 (The List Reprints)

Equipped creature has deathtouch and lifelink. (Any amount of damage it deals to a creature is enough to destroy it. Damage dealt by this creature also causes you to gain that much life.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

NM - $7.80
LP - $6.20
MP - $4.70
HP - $3.10
DMG - $1.60