Maiden's Quest: Promo 5 – Drinking Steins

On promo cards 2-5, you collect the signatures of up to 5 people when specific conditions are met. You afterwards integrate the signed card in your deck to get a bonus. Condition for promo 5: when you and another player both have Steins during a Serendipity, tap them together afterwards. Reward: place in deck as extra discovered treasure.