I need to know the name of this artifact

[Oversoul]

Yeah, assuming you also had Enduring Renewal...

 

[Lythand]

yea I been out of the loop for 2 1/2..3 years..From what I was told though only the legendary ruling has changed with 2 legends in play.

 

[Spiderman]

That might have been the major "general rules" thing, but individual cards still get errata...

 

[Oversoul]

...for example: Time Vault.