They Call Her Cloud Retainer

Combat Action: When your active character is Xianyun, equip this card.\nAfter Xianyun equips this card, immediately use White Clouds at Dawn once.\nWhen you switch characters, this card gains 1 Storm Pinion stack. (Max 2 stacks gained per Round)\nWhen your Xianyun, who has this card equipped, uses Word of Wind and Flower, consume all Storm Pinion stacks. Each consumed stack increases DMG dealt by 1.\n(You must have Xianyun in your deck to add this card to your deck.)