Galactic Rift

{w}{u}{b}{r}{g}{x}{t}: Move a number of target
creature or artifact cards equal to X times two
from your library or the battlefield into your
graveyard.
{x}{t}: Put X target creature or artifact cards from
your graveyard on top of your library in any
order.
{x}{t}: Put the top card of your library into your
hand. If its mana cost is less than X, you can cast
it this turn without paying mana.