GER is a difficult stand to replicate, as it ties into the concept of fate and will, how does one replicate this in minecraft?
Fate in jojo is often seen as pre-determined, a path everyone follows and as such, certain people are fated to die, and others fated to live, GER directly challenges this, allowing giorno to escape his destined fate of death by Diavolo's hand, however since Diavolo was also fated to win, and thus not die, he instead was subjected to an infinite number of near deaths, as a means of preventing giorno's death since he was, in fact, fated to die, the death loop was GER's solution to that paradox.
So how do we implement fate into Minecraft in a way that isn't overblown and complicated? We don't. The paradox that caused Diavolo's deathloop was, in turn, because he decided to observe the future and dictate giorno's fate, it functioned like a Schrodinger's cat, creating a definite outcome that then had to be "returned to zero" by GER, so until king crimson gets added, the deathloop doesn't need to be added
So then let's talk abilities.
PASSIVE: Return to Zero
So long as GER is summoned, the user effectively cannot die, if they are dealt what should be a fatal blow or are subjected to any time-based abilities (Such as TS) It will simply be reversed to right before the action occurred, this could de-summon the stand for balance's sake.
STATS:
GER will have Maxed stats in all categories, except development potential, since it has technically reached it's peak.
ABILITIES:
Life Giver (Requiem): Giorno's normal life powers, instead creates 4 of the creature compared to the normal 1.
Projectile beam: Take any block in your off-hand, propel it forward at ridiculous speed in the form of a beam, exploding wherever it hits
Heal: Same as base GE, maybe make it a bit stronger in trade.
Life Sense: Make all nearby creatures glow unless not touching a block connected to the one the player is on. if touching a person, also be able to tell if they have a stand