leyline of singularity + goryo's vengeance

[joshisme]

if leyline of singularity is in play and a creature that normally isn't legendary is in my graveyard, can i return it with goryo's vengeance? Why or why not?
Thanks in advance.

[Van Phanel]

No. Leyline of Singularity only cares for permanents. And permanents only exist in play.