Obelisk, the Tormentor

Shroud
Obelisk, the Tormentor can't be countered.
As an additional cost to this spell, sacrifice three creatures.
When Obelisk, the Tormentor enters the battlefield from outside your hand, sacrifice it
at the beginning of the next end step.
{t}, Sacrifice two creatures:Destroy all creatures
you don't control. Activate only as a sorcery.