If you get a player down to 0 life can he still use Soul Conduit's ability and swap life totals with another player killing that player instead?
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No, unless the player has a "Cannot lose" effect in play, like Platinum Angel.
When a player goes to 0 life, before priority is regained (and the player able to activate Soul Conduit), state-based actions are checked and the player loses the game.
Even if the ability were on the stack, it doesn't resolve before state-based actions, again. (e.g. 1 life, activate Conduit, use Underworld Connections)
No, you cannot do that.
When you go down to zero life, you lose the game immediately, before you have a chance to do anything.
The exception is if you have a card that prevents you from losing the game for having 0 or less life, such as Platinum Angel or Phyrexian Unlife. If you have one of those, then you will be able to act while you have 0 life, and you will have the opportunity to set another player's life total to 0.