From MTG Salvation Wiki
The controller of a card is the person who has control of it. This is normally the owner of the card, but control can change with cards like Control Magic.
From the Comprehensive Rules
- Control, Controller
- A permanent’s controller is whoever put it into play unless the spell or ability that put the permanent into play states otherwise. Other effects can later change a permanent’s controller.
- A spell or activated ability on the stack is controlled by whoever played it. A copy of a spell is controlled by the player who put it on the stack. A triggered ability on the stack is controlled by the player who controlled its source at the time it triggered, unless it’s a delayed triggered ability. The controller of a delayed triggered ability is the player who controlled the spell or ability that created it.
- Objects in zones other than in play or the stack have no controller. If anything asks for the controller of an object that doesn’t have a controller, use its owner instead.
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