Featherweight Foam

Combat Action: When your active character is Hydro Hilichurl Rogue, equip this card.\nAfter Hydro Hilichurl Rogue equips this card, immediately use Slash of Surging Tides once.\nWhen your Hydro Hilichurl Rogue, who has this card equipped, is on the field, spend 1 fewer Elemental Die when using a Technique. (Once per Round)\n(You must have Hydro Hilichurl Rogue in your deck to add this card to your deck.)