However, assuming that you're building a fairly typical deck, there is a really simple way of figuring out about how many lands you should put in your deck
Tron is the archetype now main-decking copies of Trinisphere, which you'd think would normally be a firm sideboard card
As beautiful as it is deadly
Absolute Virtue This notorious monster returns to bring ruin to your alliance
The standard version is standard black, but it comes in a variety of colors, sizes, and closures, so you can be sure to find one that fits your needs
Every seasoned player will tell you buying singles is cheaper, but it lacks the pure thrill of cracking a fresh pack