Rebirth passives

Most of the rebirth passives seem lackluster at the moment due to how they play out.

They basically become a standard either wait a few seconds like zhonya's and throw more abilities or worse, like zac or eggnivia, just continue to killed, it just takes longer every so often.

I think there are some easy quick ways to boost the champ and make them more viable

Eggnivia -- two ways you could go here, one being that the Egg will ALWAYS rehatch which makes it a LOT more viable as a passive, so just make the egg untouchable. OR if you want the egg to be able to be destroyed make it an actual Investment. Allow anivia to "roll" or "rock" the egg to avoid some abilities but it slows the rebirth as the soul is drawn into the egg, thus the EGG can try to hide until reborn. This would be more fitting for phoenixes of any type.

Zac -- I think instead of all the globs coming to a central point which each can be destroyed easily is meh. Fun to see but meh in terms of use. I can t act or move or do anything other than hope people leave the area, rarely has a zac respawn saved the day in anything other than a moving team fight I think a random number of globs should be generated upon death, based on random stat criteria, each glob tries towards nexus or towers as fast as randomly inherited speed spawned at time of the full zac splosion. --- After 5 seconds if any of the globs that spawned are still alive, zac respawns at one of them, the others become mimic zacs w/o atk abilities, but will begin to move towards the main zac and rejoin him as living health.
Every other "zac" that Zac absorbs adds to ar/mr until the next "death" as his cohesion has "learned" to defend against types of attacks. After passive resets this "learned" defensive matrix goes away as Zac is instable, unstable?

Aatrox -- I did on another thread.