Rules FAQ
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"Spend" refers to any ability that allows a player to choose to pay gold or move gold from his or her gold pool. This includes paying costs and moving gold for bestow. (See Spending Gold.)
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You can choose any card in play, even if it does not have the bestow keyword or any other interaction with gold in its text. You can also choose a card with bestow that already has gold equal to or higher than its X value. You cannot add any gold to your gold pool with Casterly Rock.