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This is why you wont die if you target yourself with Lightning Helix, even if youre on one life: eliminating players who are out of life is also an SBA, so as long as the Helix heals you back to a positive total before it finishes resolving and SBAs are next checked, youll be okay

This was Jeska's first rebirth

Blade of Shared Souls will become unattached and the copy effect will end

You could, alternatively, choose to turn that mill on yourself with the combination of Greater Good and Laboratory Maniac

Any player not chosen by one of these effects chooses a nonland permanent on the battlefield, and destroys it, then draws a card