Obelisk The Tormentor

This card can't be countered. If Obelisk The Tormentor wasn't cast, Sacrifice it.
Hexproof
{t}, Sacrifice two creatures: Destroy each creature your opponents controls, then each opponent
loses half their life rounded down.
{u/b}, Sacrifice two creatures: Obelisk The Tormentor gains +12/+12 and indestructible until your next
untap step.