Discussion Forum

I've got two main problems with my deck: http://www.mtgvault.com/ViewDeck.aspx?DeckID=386035

1 - Average CMC is pretty low, so I was thinking that maybe I could put in the deck less than 24 lands, maybe 22 or even 20. I would prefer a mathematic answer cause I made this deck using excel. However an experience answer will be accepted too. Is there some math book about mana?

2 - It doesn't have a sideboard. I don't really get how it works (how can you put the sideboard cards in the deck if you don't know who are you going to play with?) and I don't really know how to make one. Could someone make an analysis of the weakness of this deck? Against which kind of decks I could easily lose? And could you also give me some card advice? I'm a beginner and I'm not able to understand the whole thing.

Thanks!