Rule 702.174a

Gift is a keyword that represents two abilities. It is written “Gift a [something].” The first ability is a static ability that functions while the card with gift is on the stack, and the second is either an ability that functions while the card with gift is on the stack or a triggered ability that functions while the card with gift is on the battlefield. The first ability is always “As an additional cost to cast this spell, you may choose an opponent.” Paying a spell’s gift cost follows the rules for paying additional costs in rules 601.2b and 601.2f–h. The second ability depends on the [something] listed as well as whether the object with the ability is a permanent or an instant or sorcery spell.