Zen Takahashi Realistically, it was never going to be any other card
Cards searching your library for any card are the most powerful tutors and can elevate the power level of a deck since it adds consistency and makes any strategy/combo/synergy much efficient
Sure, youll usually have to wait a turn for the recursion, but that is an insanely efficient rate for what is effectively 2 spells (more if youre lucky!), and if this isnt instantly slotted into the majority of decks that can play it, Ill be shocked
For example, some cards can get things into the graveyard, some cards can use the graveyard as a resource, and some cards can only work while in the graveyard
But why do you care
According to WotC, the plane of Ulgrotha was sealed off the rest of the multiverse (then known as Dominia) and wasnt be affected by the Urza and Mishras war or its consequences