Question: how to unlock judas in binding rebirth?
Answer: Judas (ユダ, Yuda) is an unlockable character in The Binding of Isaac. He is unlocked by completing The Womb or Utero for the first time. In Rebirth, Judas is unlocked by defeating Satan for the first time with any character. When a character dies holding Judas' Shadow, they will be revived as Black Judas.