Distal Mnemosyne

If you have three or more creatures in your
graveyard, at any time you may pay {2} to look at
the top card of your library. You may choose to
move that card to the bottom of your library—if
you do, add {1} to your mana pool; if you don't,
draw a card.
The long-dead race of cosmic beings had lived for
millennia within the spaces between planes and
worlds, before finally aging into oblivion.