The Maw of Phyrexia

If you would mill one or more cards, mill twice
that many cards instead. (To mill a card, put the
top card of your library into your graveyard.)
Delirium — {1}{b}, {t}, Exile four cards from your graveyard: Search your library for a card, put
that card into your hand, then shuffle. Activate
this ability only if there are four or more card
types among cards in your graveyard.