The Darklight

Whenever The Darklight is put into the
graveyard or exile from anywhere, put it into
your library fourth from the top instead.
At the beginning of each opponents upkeep, that player exiles the top card of their library. You
gain life equal to the total mana value of the card exiled. Draw a card if a land is exiled. You may
cast cards exiled this way as long as they remain
exiled, spending mana as though it were any type
to cast them.