Break of Day | Magic: The Gathering
Formats Break of Day is Legal in
Official Oracle Text for Break of Day
Fateful hour — If you have 5 or less life, those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)
Official Rulings for Break of Day
7/1/2013 : Break of Day checks your life total only at the time it resolves. Any creatures that gain indestructible will continue to be indestructible that turn even if you gain life.