Key to the Uttermost East

Whenever a land enters the battlefield under
your control, draw a card.
{4}: Sacrifice all your lands. Search your library
for up to that many land cards, at least half of
which must be basic lands. Put them into the
battlefield tapped, then shuffle your library.
At the end of the turn, Sacrifice Key From
the Uttermost East.
"This isn't the temple I came into." - Pizarron,
Lost Explorer - now of Amonkhet.