The Earthy is the final card, the last of the 4 elemental cards, and one of the cards (with Firey) that Kero needed to regain all of his powers. It summons earth (ex: earthquakes).
Earthy was destroying the city (in the 45th episode), so Sakura used the Wood to capture it. As soon as she signed her name on it, the judgement began and Yue woke up.
