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.)

Basilisk Collar

Secret Lair Drop

If the fearsome basilisk demands pets, pets will be given.

Foundations

During their endless travels, the mages of the Goma Fada caravan have learned ways to harness both life and death.

Duskmourn: House of Horror Commander

A mark of companionship, not subservience.

Fallout

Equipped creature has deathtouch and lifelink.
Equip {2}

The List

Some patriars pay massive sums for exotic pets that can give their posh, predictable lives an edge of danger.