Southron Champion

Champion a Land (When this creature enters the battlefield, sacrifice it unless you exile a land you
control. When this leaves the battlefield, that card
returns to the battlefield.)
Double strike (This creature deals both first-strike
and regular combat damage.)
When Southron Champion enters the battlefield,
if an opponent controls more lands than you, you
may search your library for a land card, put it
onto the battlefield, then shuffle your library.