Ring of the Dwarf Lords

{t}; Add {r}.
You can play an additional land on your turn.
Lands you control do not produce mana.
Sacrifice a land; Create two treasure tokens and
draw a card.
Seven rings Sauron gave to the Fathers of the
Dwarves; although he could not corrupt them with
the One directly, the rings magnified their greed and
distrust, and their downfall came just the same.