Oster's Rest, Home of Heraldry

Oster's Rest, Home of Heraldry enters the battlefield tapped.
{t}: Add one mana of any color. Use this mana
only to cast human spells.
{5}, {t}: Creatures you control get +2/+2 and
gain vigilance until end of turn.
The fate of this city rests in the hands of disavowed
knights... by the Gods!