Bleak Falls Barrow

{t}: Add {c}.
At the beginning of each end step, if a
creature died this turn, you may put a
quest counter on Bleak Falls Barrow.
{c}, {t}, Sacrifice Bleak Falls Barrow:
Create Golden Dragon Claw, a legendary artifact with "{t}: Add one mana of any type that a land you control could produce." Activate this ability only while Bleak Falls Barrow has three or more quest counters on it.