Obelisk, The Tormentor

Hexproof & Protection from creatures
Trample
If you cast this creature for its casting cost, it
cannot be countered. If not, sacrifice this card.
Sacrifice 3 non-token creatures, destroy all
creature cards on the battlefield. If the destroyed
creature power total is more than this card's
toughness, Obelisk gets +X/+X where X is its toughness.
" This is his domain, we're just rats trying survive
and once he finds us, its over" -Urza