Galadriel Sunbane

Sources you control deal twice as much damage to permanents with curse counters on them.
{t}{b}{b/r}: Put a Curse Counter on target creature or planeswalker.
{t}{b}{w/b}: Galadriel Sunbane deals 3 damage split between any number of target creatures and/or planeswalkers.
{t}{u}{r/w}: Counter target spell with mana value 2 or less that targets you or a permanent you control.