Blind Scribe of Ostia

When Blind Scribe of Ostia enters the
battlefield, each opponent mills three cards.
{t}: Return Blind Scribe of Ostia to your hand.
Delirium — At the beginning of each
opponent's upkeep, if there are three or more
card types among cards in your graveyard, that
player mills three cards.
"Lege videre, ora pro spe"