19 minutes ago, JJ48 said:So in broader terms, does "owner" refer to the player controlling a card at the time, or to the player playing the deck the card came from?
Typically, the "owner" of a card is the player whose deck it started in (it doesn't ever change during a game), while the "controller" is the player who controls it (initially, it's the owner, but it can change during a game).