Chronomaster's Astrolabe

When Chronomaster's Astrolabe enters the
battlefield, you may search your library for a
basic land card, put that card onto the battlefield,
then shuffle your library.
When Chronomaster's Astrolabe is sent to the
graveyard from the battlefield,
draw a card and then take an extra turn after
this one. Exile Chronomaster's Astrolabe.