Skull Saucer

• WWizards of the Coast2020-02-29
  Official Ruling
  If you are playing with your head on the table, other players can’t attempt to physically dislodge you. They can try and talk you into moving.
• WWizards of the Coast2020-02-29
  Official Ruling
  You don’t have to put your head on the table if you don’t want to. The enters-the-battlefield ability will still destroy the target creature, and Skull Saucer will then be sacrificed.
• WWizards of the Coast2020-02-29
  Official Ruling
  You can use any part of your head, such as your chin.
• WWizards of the Coast2020-02-29
  Official Ruling
  If you’re not playing on a table, putting your head on the playing surface will count. (Wait, what are you playing on? Doesn’t matter.)

Rulings via Scryfall