Cavalier of Emeralds

Cavalier of Emeralds' power and toughness are
each equal to the number of lands you control.
When Cavalier of Emeralds enters the battlefield reveal the top card of your library until you
reveal a land card. Put it onto the battlefield and
the rest on the bottom of your deck in a random
order.
When Cavalier of Emeralds dies you may return
target land from your graveyard to the battlefield.