The Unforgiving battering ram

Hexproof
{t}: Add {x}{w}{b}, where {x} is the greatest power
among creatures you control.
{1}{w/b}{t}: Destroy target creature. If this ability is
used during a opponent's turn, that player loses
life equal to the creature's toughness or power,
whatever one is greater.
Used by the Orzhov to punish civilians who have not
paid their debt.