for summoning arcane apprentice and magician of faith and all level 2 and lower spellcaster type monsters hand of nephthys in a Sacred Phoenix deck, or Old Vindictive Magician also work EDIT: Basically they're there to, for one, thin out your deck, and for two, bring out level 2 monsters from the deck. Oh, and thirdly, if you're using a magic counter deck, they give a free magic counter.