A few moments ago Mateo Kovacic vs Leandro Trossard World Cup Showdown SBC Cards got leaked. We do not know if these cards will effectively be released but according to FUT Sheriff, The Kovacic vs Trossard 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.
Croatia are playing against Belgium on 01 December 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.