Mark 13:22 and John 4:48 refer to deceptions done by false Christs and false prophets, while Acts 4:30, Acts 5:12, Acts 14:3, Romans 15:19 and Hebrews 2:4 each speaks of the miracles performed by the Apostles which are no more being performed.
Beyond that, the resurrection.
Signs are from God....not from us.
See Mt 24 & 25