Loathsome Curator

• WOTC Official Reminder Textofficial rules
  Menace — This creature can't be blocked except by two or more creatures.

• WWizards of the Coast2021-06-18
  Official Ruling
  You can sacrifice the creature with exploit if it's still on the battlefield. This will cause its other ability to trigger.
• WWizards of the Coast2021-06-18
  Official Ruling
  If the creature with exploit isn't on the battlefield as the exploit ability begins to resolve, you won't get any bonus from the creature with exploit, even if you sacrifice a creature. Because the creature with exploit isn't on the battlefield, its other triggered ability won't trigger.
• WWizards of the Coast2021-06-18
  Official Ruling
  You can't sacrifice more than one creature to any one exploit ability.
• WWizards of the Coast2021-06-18
  Official Ruling
  You choose whether to sacrifice a creature and which creature to sacrifice as the exploit ability resolves.
• WWizards of the Coast2021-06-18
  Official Ruling
  A creature with exploit “exploits a creature” when the controller of the exploit ability sacrifices a creature as that ability resolves.

Rulings via Scryfall