1. Use the format suggested by the rules posted at the top of the Card Creation Forum.
2. This has some minor template issues. I'm pretty sure that the card leaves your hand upon announcement and 
then you pay associated costs, so this would probably need to be:
If you have no cards in your hand, you may play ~this~ without payint its mana cost.
Search your library for any three black cards and reveal them. An opponent chooses one. Remove that card from the game and lose life equal to that card's converted mana cost. Put the other two cards into your hand. Then shuffle your library.
3. As far as the card itself goes, I think it's a little too strong. Intuition is a pretty good card and I think that (especially for an off-colour card), this is better.
 Cards like Necropotence demonstrate that paying life to get cards into your hand is not a significant drawback. With this, for three mana (or zero, if this is the last card in your hand!) you get to tutor for two cards. Granted, you don't get the best of the three cards you dig up, but in a deck that is likely to have at least three very good cards, this is hardly ever going to hurt you. Although they have to be black, mono-black is a reasonably strong archetype (although maybe not in Type 1). At the very least, you need to remove the clause that makes this card playable for free. You might also reasonably have this card only let you dig up two cards, one of which you keep and one of which you ditch (oppponent's choice), losing life equal to the C.M.C. of either card. That would be fair at 


.