Mysteries Unfold

Look at the top ten cards of your library, put two
of them in your hand and the rest at the bottom
of your library in random order.
Delirium—As long as there are four or more
types among the cards in your graveyard, you
may cast this for {2}{u/b}{u/b} instead and its effect
becomes "Target player mills ten cards and
shuffles two back into their library. "