If an object is no longer in the zone it’s expected to be in as an effect causes it to deal damage, its last known information is used to determine whether it had deathtouch.
September 30, 2011 · Innistrad
If an object changes zones before an effect causes it to deal damage, its last known information is used to determine whether it had deathtouch.
June 17, 2011 · Commander 2011
If an object changes zones before an effect causes it to deal damage, its last known
February 4, 2011 · Mirrodin Besieged
If an object changes zones before an effect causes it to deal damage, its last known information is used to determine whether it had deathtouch.
October 1, 2010 · Scars of Mirrodin
If an object changes zones before an effect causes it to deal damage, its last known
July 16, 2010 · Magic 2011
If an object changes zones before an effect causes it to deal damage, its last known information is used to determine whether it had deathtouch.
February 1, 2010 · Worldwake
The deathtouch rules function no matter what zone an object with deathtouch deals damage from.