Into Imagination

At the beginning of your upkeep draw X cards,
then put the top X cards of your library into
your graveyard where X is the number of cards
in your graveyard.
At any time, you may put the top X cards
of your library into your graveyard, if you do, you
may play target card from your graveyard with
the same converted mana cost of cards put into
your graveyard this way, without paying its mana
cost.