The source of damage is the object that dealt it. If an effect requires a player to choose a source of damage, they may choose a permanent; a spell on the stack (including a permanent spell); any object referred to by an object on the stack, by a prevention or replacement effect that’s waiting to apply, or by a delayed triggered ability that’s waiting to trigger (even if that object is no longer in the zone it used to be in); or a face-up object in the command zone. A source doesn’t need to be capable of dealing damage to be a legal choice. See rule 609.7, “Sources of Damage.”
May 3, 2019 · War of the Spark
Some replacement effects and prevention effects result in one or more card draws. In such a case, if there are any parts of the original event that haven’t been replaced, those parts occur first, then the card draws happen one at a time.
January 25, 2019 · Ravnica Allegiance
Some replacement effects and prevention effects result in one or more card draws. In such a case, if there are any parts of the original event that haven't been replaced, those parts occur first, then the card draws happen one at a time.
February 1, 2014 · Born of the Gods
Some replacement effects and prevention effects result in one or more card draws. In such a case, if there are any parts of the original event that haven’t been replaced, those parts occur first, then the card draws happen one at a time.
July 1, 2012 · Magic 2013
Some replacement effects and prevention effects result in one or more card draws. In such a case, if there are any parts of the original event that haven't been replaced, those parts occur first, then the card draws happen one at a time.
September 30, 2011 · Innistrad
Some replacement effects and prevention effects result in multiple card draws. In such a case, any parts of the original event that haven't been replaced by the effect occur first, then the card draws happen one at a time.
June 17, 2011 · Commander 2011
Some replacement effects and prevention effects result in multiple card draws. In such a case,
April 1, 2011 · Duel Decks: Knights vs. Dragons
Some replacement effects and prevention effects result in multiple card draws. In such a case, any parts of the original event that haven't been replaced by the effect occur first, then the card draws happen one at a time.
February 4, 2011 · Mirrodin Besieged
Some replacement effects and prevention effects result in multiple card draws. In such a case, any parts of the original event that haven’t been replaced by the effect occur first, then the card draws happen one at a time.
October 1, 2010 · Scars of Mirrodin
Some replacement effects result in multiple card draws. In such a case, any parts of the original
July 16, 2010 · Magic 2011
Some replacement effects result in multiple card draws. In such a case, any parts of the original event that haven't been replaced by the effect occur first, then the card draws happen one at a time.