Lifeline Wrath of God Rulings

[Murloc]

If I have lifeline

Whenever a creature is put into a graveyard from the battlefield and another creature is on the battlefield, return the first creature from that graveyard to the battlefield under its owner's control at the beginning of the next end step.

and someone plays a wrath of god:

Destroy all creatures. They can't be regenerated

Do all my creatures live or do all my creatures die? Or what happens?

[Twanos]

All of your and their creatures die but will come back at the end of turn because lifeline affects both players.

Please note they will all come back in 1 at the time not all at once.

If more than one creature is in play and all the creatures in play go to the graveyard at once (such as with Wrath of God), then all of them are returned at end of turn. [WotC Rules Team 1998/10/18]
This is because all "leaves play" triggers that check the state of the game check the game state at the time right before the card left play. [D'Angelo 1998/11/17]