@33MHz it's an Elo. A brazilian credit and debit card brand created by a few of the major banks. Their international cards have BINs starting in 6, in a partnership with Discover/American Express(same entity) and work on their network outside BR.
@33MHz in fact, in the back it has the Pulse ATM, Discover and Diners(sorry, not Amex as I said before) logos to state that you can use it on those networks outside Brazil.
@33MHz it's a bit crap to use online(not all online stores accept Elo), but physical stores usually it works(it even works on Google and Apple Pay now. Some foreign online stores will take it as a Discover card(specially if it's foreign currency).