Combine Harvester

When Combine Harvester enters the battlefield,
you may sacrifice a land. If you do, search your library for up to two land cards, put them onto
the battlefield tapped, then shuffle your library.
When Combine Harvester attacks, exile it, then
return it to the battlefield under your control.
Crew 2 (Tap any number of creatures you control
with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)