Mary, the True Masterpiece

Menace, First Strike
As an additional cost to play Mary, the True Masterpiece, sacrifice a human.
{w/b}{w/b}{w/b},{t} Deal 1 damage to target creature for each {b} spent to activate this ability and gain 1 life for each {w} spent to activate this ability.
{ut}, deal 1 damage to target creature, if that creature is a human: detain it. Activate this ability only if Mary, the True Masterpiece is equipped.