Cassian, of Shadows Past

If you would mill one or more cards, surveil
that many cards instead.
Delirium — At the beggining of your upkeep you
may reveal the top card of your library, then
choose target nonland permanent card in your
graveyard. If the card shares a card type with the
revealed card return it to the battlefield. Put the
revealed card into your graveyard. This ability
only triggers if there are four or more card types
among cards in your graveyard.