Rule 201.5a

If an ability’s effect grants another ability to an object, and that second ability refers to that first ability’s source by name, the name refers only to the specific object which is that first ability’s source. The second ability does not refer to any other object with the same name as the first ability’s source. However, if the second ability also moved the first ability’s source to a different public zone, the name refers to the object the source became in its new zone. This is also true if the second ability is copied onto a new object. Example: Gutter Grime has an ability that reads “Whenever a nontoken creature you control dies, put a slime counter on this enchantment, then create a green Ooze creature token with ‘This token’s power and toughness are each equal to the number of slime counters on Gutter Grime.’” The ability granted to the token only looks at the Gutter Grime that created the token, not at any other Gutter Grime on the battlefield. A copy of that token would also have an ability that referred only to the Gutter Grime that created the original token.