Obelisk, The Tormentor

This spell cannot be countered.
When Obelisk enters the battlefield, sacrifice three creatures or sacrifice Obelisk.
Indestructible, hexproof, menace, first strike
and trample.
When Obelisk enters the battlefield, destroy all creatures.
{5}, sacrifice two creatures: Destroy all non-land,
non-creature permanents. Activate only as a sorcery.
Obelisk attacks each turn if able and attacks
every opponent.