White and Black Deck help

I didn't have time to review your inventory, so I don't know what other cards you have. Elpablo's advice is good: avoid running a wide selection of one-of cards (one of this, one of that).  Imagine what your ideal round would look like. What would you play on Turn 1? Turn 2? Turn 3? Build around those cards.  Try to run four of each of those T1, T2, and T3 cards. From there, add some others to give you some flexibility, or to support the rest of your build. What would support it? It depends on what playing style you prefer. If you want to be aggressive, focus on creatures that give you an advantage on getting damage through: flying, unblockable, fear, intimidate, trample, etc. If you want to slow your opponent down for a few turns while you come on mid-game, play defenders and walls.  It's up to you.

Come up with a statement about your deck that focuses on how it is going to win.  For a Goblin deck of mine, the focus is to rapidly overwhelm my opponents by  swinging on T1 and dealing loads of damage each and every turn until my opponent is dead (typically on T3 or T4).  For a Merfolk deck, the focus is to get damage through using unblockable creatures (e.g., Triton Shorestalker) and other evasion effects (things that make my creatures fly, or make an opponent's land an Island) while I put Merfolk lords on the board (each giving my Merfolk +1/+1).  I have another black/blue deck that is designed to force my opponents to run out of cards (by "milling" them--making them discard cards from their libraries).  Knowing how you want to win will help you add focus to your deck.