The Lady's Castle

The Lady's Castle enters the battlefield tapped
unless you control three or more enchantments.
{t}: Add {g}, {w} or {u}.
{t}, Sacrifice an enchantment: Add two mana of
any combination of {g}, {w} and {u}.
"Rivog creates magnificent works of magic in
her garden. I must say, their beauty is breathtaking."
—Nissa Revane