The Adventure Begins

When The Adventure Begins enters the
battlefield and at the beginning of your upkeep,
choose a party from among creatures you
control, until your next turn those creatures gain
"{3}, {t}: Venture into the dungeon." and "This
creature gets +2/+2 for each differently named
dungeon you've completed." (To choose a party,
choose up to one each of Cleric, Rogue, Warrior, and
Wizard.)