Coveted Prize

This spell costs {1} less to cast for each creature
in your party. (Your party consists of up to one
each of Cleric, Rogue, Warrior, and Wizard.)
Search your library for a card, put it into your
hand, then shuffle. If you have a full party, you
may cast a spell with mana value 4 or less from
your hand without paying its mana cost.