The thieving Necromancer

When The thieving Necromancer enters the battlefield, search target opponent's library for a
card and exile it face down. Then that player
shuffles their library. You may look at that card
for as long as it remains exiled.
{b}{b}{b}{b}{b}{b}{b}: Cast any number of face down nonland cards you don't own from exile without
paying their mana costs.
"Oh, mine, yours.These are all bourgeois
categories."