Dire Fleet Ravager

• WOTC Official Reminder Textofficial rules
  Menace — This creature can't be blocked except by two or more creatures.
• WOTC Official Reminder Textofficial rules
  Deathtouch — Any amount of damage this deals to a creature is enough to destroy it.

• WWizards of the Coast2017-09-29
  Official Ruling
  For example, if you have 13 life, you'll lose 5 life.
• WWizards of the Coast2017-09-29
  Official Ruling
  If a player has 1 life, that player loses 1 life. If each player has 0 life after that, the game's a draw.
• WWizards of the Coast2017-09-29
  Official Ruling
  In a Two-Headed Giant game, each player loses a third of the team's life total rounded up. For example, if a team has 13 life, each player on that team loses 5 life and the team loses 10 life total.

Rulings via Scryfall