Players can always pay 0 life, no matter what their (or their team’s) life total is, and even if an effect says players can’t pay life.
July 12, 2019 · Core Set 2020
rule 119.4b not present in this release
May 3, 2019 · War of the Spark
Next, damage that’s been dealt is processed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).
January 25, 2019 · Ravnica Allegiance
Next, damage that's been dealt is processed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).
February 1, 2014 · Born of the Gods
Next, damage that’s been dealt is processed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).
September 30, 2011 · Innistrad
Next, damage that's been dealt is processed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).
June 17, 2011 · Commander 2011
Next, damage that’s been dealt is transformed into its results, as modified by replacement
April 1, 2011 · Duel Decks: Knights vs. Dragons
Next, damage that's been dealt is transformed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).
February 4, 2011 · Mirrodin Besieged
Next, damage that’s been dealt is transformed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).
October 1, 2010 · Scars of Mirrodin
Next, damage that’s been dealt is transformed into its results, as modified by replacement
July 16, 2010 · Magic 2011
Next, damage that's been dealt is transformed into its results, as modified by replacement effects that interact with those results (such as life loss or counters).