Craz, Reckoner among Zeth

+1: You gain 1 life. Then, if you control fifteen or more creatures, you may pay 1 life. If you do, draw a card, then discard a card.
-3: Destroy target tapped creature. If that creature had converted mana cost 2 or less, you may look at the top card of your library.
-15: Multiply your life total by three. For each life gained this way, create a 1/1 white Human creature token.