Let's say I'm at -10 life but Phyrexian Unlife is keeping me alive. I have a random creature in play as well as Worship when opponent hits me for 5 damage. Does my life total go back up to 1? -10 life is less than 1, so presumably Worship's effect would occur, but if I go from -10 to 1 life, my life total wouldn't be "reduced".
What about Phyrexian Unlife's effect - do I gain 5 poison counters? What if instead of Phyrexian Unlife it is some other effect like Platinum Angel keeping me alive?
Text of relevant cards:
Worship: If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead.
Phyrexian Unlife: You don't lose the game for having 0 or less life. As long as you have 0 or less life, all damage is dealt to you as though its source had infect. (Damage is dealt to you in the form of poison counters.)
Platinum Angel: You can't lose the game and your opponents can't win the game.