Clockwork

Defender, Ward—Pay 3 life.
{x}{b}, {t}: Put X -1/-1 counters on target creature.
{x}{b}, {t}: Target player mills X.
{x}{u}, {t}: Scry X.
{x}{u}, {t}: Counter target spell with converted
mana cost X or less.
Untap Clockwork whenever you lose life.