Omnath, Locus of the Rift

Lands you control are indestructible.
Sacrifice a land: Create a copy of the sacrificed
land tapped that is also an artifact in addition to
its other types.
Whenever you sacrifice a land, put a +1/+1
counter on Omnath.
Whenever Omnath attacks, search your deck for
a land card and put it into play tapped. Then
shuffle your library.