Rattler of the Lost Lock

Deathtouch, hexproof, indestructible, protection from enchantments
When Rattler of the Lost Lock enters the battlefield, each opponent creates a colourless Equipment artifact token with "Equip {6}" and indestructible named Lost Key.
Whenever Rattler of the Lost Lock blocks or becomes blocked by a creature with an artifact named Lost Key attached to it, sacrifice Rattler
of the Lost Lock.