Dark Angels Librarian

Purity {1} (Spells targeting this creature cost
{1} more mana to cast
{w/b}{w/b}{t} Negate target instant, sorcery, or
enchantment with converted mana cost of {4} or less
{2}{w/b}{w/b}{t} Target creature recieves -2/-2
until end of turn
"I will destroy their minds and burn their bodies"