Volo, Guide To Monsters

[Volo's Stories {3}{u}, Sorcery-Adventure: Search
your library for a nonhuman creature, shuffle the
rest of your library and put that card on top.]
The first time each turn a creature enters your battlefield, Venture Into The Dungeon.
Volo gains +1/+1 and Reach for each differently
named dungeon you've completed.
Choose a Background.