Obelisk the Tormentor

Haste, Flying, Vigilance, Trample, Shroud
Devoid
Annihilator 4
This card can't be countered, or cast from anywhere
except your hand.
Tribute 3 (As an additional cost to cast this card,
sacrifice 3 creatures you control with total converted
mana cost 20 or more.)
{t}Sacrifice 2 creatures you control. Exile all creatures
and planeswalkers your opponent(s) control.