Launch a Secret Santa gift at your opponent's castle. In addition to any damage, if the ammo lands inside their castle, the closest troop (max distance of 4 from the gift) picks it up and opens the gift. They are so moved by the kindness of the gesture that they decide to switch teams! Remove that troop from the enemy's castle, get a troop matching your color from the box and place them following the Troop Placement rules in your castle!