Secluded Courtyard

As Secluded Courtyard enters the
battlefield, choose a creature type.
{t}: Add{c}
{t}: Add one mana of any color. Spend
this mana only to cast a creature spell of
the chosen type or activate an ability of
a creature or creature card of the chosen
type.

Despite his best efforts to try entering the castle
unnoticed, the vampires know that Gabriel is coming.