FIFA 21 Shapeshifters event is expected to be available in October 2021 in FUT 21. There are brand-new Shapeshifters cards as well as SBCs, Objectives and Special packs during the Shapeshifters event.
TheShapeshifter player cards are available for footballers who improved their performance by playing in other positions rather than their preferred ones.
Shapeshifters players list is available here:
Squad Building Challenges
Special limited-time SBCs will be available for Shapeshifters event. SBC list to be available here soon.