This is not a scam. The government is sending some people Economic Impact Payment Cards if they qualified for a stimulus payment and the IRS couldn’t direct deposit the payment.
Your Economic Impact Card will come in a plain envelope from “Money Network Cardholder Services” along with important information about the card, instructions for activation, fees, and a note from the U.S. Treasury. The card itself will have the words “VISA” and “DEBIT” on the front and the issuing bank, “MetaBank, N.A.”, on the back and should look like this: