Dwarven Hut

Dwarven Hut enters the battlefield tapped.
{t}: Add {r}.
When Dwarven Hut enters the battlefield you
may sacrifice it, if you do, add one mana of any
color to your mana pool.
A hut made by dwarves is short and tough
to crack. Amenities include pots pans utensils and
wool beddings.