Back to Back is a Riftbound card. Compare listings from Singapore Riftbound sellers on CardJio, then jio them on WhatsApp.
[Reaction] (Play any time, even before spells and abilities resolve.) Give two friendly units each +2 {might} this turn.
[反应]（可在任意时机打出，甚至先于其他法术和技能的结算。） 让两名友方单位本回合内{might}+2️。