The Art of War

Creatures you control gain +2/+1 if they are attacking.
{r}{r}{r}{t}: Creatures you control gain Haste
until end of turn.
{w}{w}{w}{t}: Creatures you control gain
Vigilance until end of turn.
{w}{r}{r}{t}: Untap all creatures you control that
attacked this turn. You may declare an additional
attack this turn. At the end of turn, exile The
Art of War. Use this ability only once per turn.