Obelisk the Tormentor

Reveal this card from your hand and sacrifice
three creatures: Put this card onto the battlefield
under your control. Activate this ability only as
a sorcery.
Obelisk the Tormentor can't be countered
Hexproof, flying, haste, vigilance
When this creature enters the battlefield,
opponents can't cast spells or activate abilities
until end of turn.
Sacrifice two creatures, {t}: Destroy all creatures
target opponent controls.