Zek Hal Pathfinder

Sacrifice Zek Hal Pathfinder and any number of other non-token creatures you control: Search your library for X basic land cards, where X is the number of creatures sacrificed this way. Put those lands onto the battlefield tapped. The shuffle your library.
Explorers that are brave enough to traverse the Zek Hal region are often stupid enough to employ the undead to gain knowledge of the region.