You may reveal this card from your opening hand. If you do, at the beginning of the first upkeep, each opponent
mills (To mill a card, a player puts the top card of their library into their graveyard.) seven cards.
Flying (This creature can't be blocked except by creatures with flying or reach.)
When Chancellor of the Spires enters the battlefield, you may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost.