Fleshbag Marauder

• WWizards of the Coast2020-11-10
  Official Ruling
  As Fleshbag Marauder's ability resolves, first the player whose turn it is chooses a creature to sacrifice, then each other player in turn order does the same knowing the choices made before them. Then all those creatures are sacrificed simultaneously.
• WWizards of the Coast2020-11-10
  Official Ruling
  When its ability resolves, you may sacrifice Fleshbag Marauder itself. If you control no other creatures, you'll have to sacrifice Fleshbag Marauder.

Rulings via Scryfall