Nexos, King of Nightmares

+2: Take control of target tapped creature until end of turn. It untaps and gains haste.
+2: Target one creature that each player controls. Destroy those creatures. You lose 1 life for each creature destroyed this way.
-10: Each opponent must choose one: Sacrifice all but one creature that they control, or go down to 1/3 of starting life total rounded down.