Dance with the Shadows

When you cast Dance with the Shadows choose a basic land type
Enchanted creature has +1/+0 and basic landwalk of the chosen type
"The mist filled Moloro swamps to the north of Gavimorn are treacherous by anyone's standards, and those you survive best do so by becoming almost mist-like themselves"
-From Niv-Mizzet's notes on Amanu