Lazav, Dimir mastermind, copying Growth-Chamber Guardian, and wearing spy kit
No, the "Search for a card named Growth-Chamber Guardian" is not self-referential, you are not searching for the card itself, but that ability is naming the legal targets for your search. Just because the targets have the same name as the original card does not make it self-referential, in fact if it were you would only be able to find the copy of Lazav already in play.