Flying (This creature can't be blocked except by creatures with flying or reach.)
When Eccentric Apprentice enters the battlefield, venture into the dungeon.
(Enter the first room or advance to the next room.)
At the beginning of combat on your turn, if you've completed a dungeon, up to one target creature becomes a Bird with base power and toughness 1/1 and
flying (This creature can't be blocked except by creatures with flying or reach.) until end of turn.