You know playing with so many cards in your deck is a bad idea, right? You should keep your deck at 20 cards to ensure you will more likely draw what you need when you need them. (Or at least have Destiny Draw or something.) At least get rid of Order to Charge. You don't have any normal monsters to use it with anyway.
I would also take out Silfer the Sky Dragon, since you don't have many cards to help you actually summon Silfer. This is obviously more of a beatdown deck anyway.
If you really want to summon Slifer, try to use monsters that special summon themselves instead, like Bubonic Vermin, Troop Dragon, and Hyena. Put a few traps that can turn into monsters to help you (Embodiment of Apophis, Tiki Curse, Swamp Mirrorer). Finally, get Double Summon or Arrivalrival for an extra summon. The truth is Slifer just isn't an easy card to play, more so if you don't focus.
Don't listen to that aquablast guy!
20 cards is not better then 30 cards 20 cards is better for some meta strategy types like Beat-decks.
If you need proof google search yu gi oh probability calculator.
You'll actually find that your start hand has a better probability balance with 30 cards and your drawing probability after that is slightly lower does not mean worse
3 same cards but if you use a lot of card combos with many cards that help all the other cards
Then the chance of drawing unwanted or unhelpful cards becomes almost nothing