The mystery telephone bidder who paid a record $33m (£20m) at Christie's in London for a Rembrandt painting--described as one of the Dutch artist’s greatest masterpieces--was named yesterday as Steve Wynn, the Las Vegas casino owner. Wynn, 67, who once accidentally put his elbow through a $139 million Picasso while showing it off to friends, is estimated by Forbes magazine to have a net worth of $1.5 billion.