If your intention is to marry Cardi B, tread lightly and maybe have your last will and testament prepared. In her new “Be Careful†video, Cardi takes a slow walk down the aisle (borrowing some Beyoncé wind) to meet her man at the altar. Only, just as quickly as she’s a blushing bride, Cardi’s a fiery widow with a vengeance. El Diablo is watching you, sir, and her name is Cardi B.