Naema, the Reclaimer

When Naema, the Reclaimer enters the
battlefield, each player chooses up to two target
lands they control, the rest become wastes.
(They lose other land types and abilities and have "{t}: Add {c}".)
{g}, {t}, Sacrifice a land: Return target land card
from your graveyard to the battlefield.

It will take generations to return Zendikar to what it
was, so we best get started.