Each absorb ability can prevent only N damage from any one source at any one time. It will apply separately to damage from other sources, or to damage dealt by the same source at a different time.
May 3, 2019 · War of the Spark
If either half of the exchange can’t be completed, the ability has no effect.
January 25, 2019 · Ravnica Allegiance
If either half of the exchange can't be completed, the ability has no effect.
February 1, 2014 · Born of the Gods
If either half of the exchange can’t be completed, the ability has no effect.
July 13, 2013 · Magic 2014
If either half of the exchange can't be completed, the ability has no effect.
June 17, 2011 · Commander 2011
Multiple instances of delve on the same spell are redundant.
April 1, 2011 · Duel Decks: Knights vs. Dragons
For more information about Fortifications, see rule 301, "Artifacts."
October 1, 2010 · Scars of Mirrodin
For more information about Fortifications, see rule 301, “Artifacts.”
February 1, 2010 · Worldwake
For more information about Fortifications, see rule 301, "Artifacts."