A few moments ago William Carvalho vs Jose Gimenez World Cup Showdown SBC Cards got leaked. We do not know if these cards will effectively be released but according to FUT Sheriff, The Carvalho vs Gimenez WC Showdown will be released soon!
Showdown items are unique items featuring improved ratings and stats. They were released for the first time in FIFA 20. One player from each team of an upcoming real world football match is selected and made available via Squad Building Challenges (SBCs) for a limited time. The player from the winning team receive +2 OVR boost, +1 Upgrade after Draw and 0 upgrade from the defeat.
Portugal are playing against Uruguay on 28 November in the FIFA World Cup 2022 fixture.
SBC requirements are yet to get leaked or officially revealed. Hope the requirements will be cheaper and those cards will be pretty useful.