If a spell creates a delayed triggered ability, the source of that delayed triggered ability is that spell. The controller of that delayed triggered ability is the player who controlled that spell as it resolved.
June 17, 2011 · Commander 2011
If a spell creates a delayed triggered ability, the source of that delayed triggered ability is
February 4, 2011 · Mirrodin Besieged
If a spell creates a delayed triggered ability, the source of that delayed triggered ability is that spell. The controller of that delayed triggered ability is the player who controlled that spell as it resolved.
October 1, 2010 · Scars of Mirrodin
If a spell creates a delayed triggered ability, the source of that delayed triggered ability is
April 23, 2010 · Rise of the Eldrazi
If a spell creates a delayed triggered ability, the source of that delayed triggered ability is that spell. The controller of that delayed triggered ability is the player who controlled that spell as it resolved.
February 1, 2010 · Worldwake
The source of a delayed triggered ability created by a spell is that spell. The source of a delayed triggered ability created by another ability is the same as the source of that other ability. The controller of a delayed triggered ability is the same as the controller of the spell or ability that created it, even if that player no longer controls its source.