Shimmering Panorama

Enchant Land
Converge - When Shimmering Panorama enters
the battlefield, search in your library for up to
X basic land cards and exile them, where X is
the number of colors of mana spent to cast it.
Whenever enchanted land is tapped for mana,
it produces an additional mana of each type that
lands exiled with Shimmering Panorama could produce.