A good starting point for building an MTG Commander deck is to use the following ratio:

* **Lands:** 36-40 lands
* **Card advantage:** 10-12 cards
* **Mana rocks/ramps:** 10-12 cards
* **Other cards:** 32-34 cards

This ratio will give you a good balance of mana, card draw, and other spells. You can adjust the ratio up or down depending on your deck's strategy and playstyle. For example, if you're playing a green deck with a lot of mana ramp spells, you might want to run fewer lands and more other cards.

Here are some tips for choosing cards for each category:

**Lands:**

* Choose a mix of basic and non-basic lands. Basic lands are essential for mana consistency, but it's also important to have some non-basic lands that can provide additional mana or other benefits.
* If you're playing a deck with a lot of colors, you may want to run more lands than usual. This is because it can be more difficult to get all of the colors of mana you need in Commander.

**Card advantage:**

* Choose cards that draw you multiple cards, such as Divination, Rhystic Study, and Wheel of Fortune.
* You can also include cards that allow you to tutor for specific cards, such as Vampiric Tutor and Demonic Tutor.
* Be careful not to overload your deck with card advantage cards, or you'll risk running out of things to do with all of the cards you draw.

**Mana rocks/ramps:**

* Choose mana rocks and ramps that can produce mana early in the game, such as Sol Ring, Mana Crypt, and Birds of Paradise.
* You can also include cards that allow you to search for lands, such as Kodama's Reach and Rampant Growth.
* Be careful not to overload your deck with mana rocks and ramps, or you'll risk running out of things to do later in the game.

**Other cards:**

* Choose cards that support your deck's strategy and playstyle. For example, if you're playing a voltron deck, you'll want to include cards that buff your commander and protect it from removal.
* You can also include cards that provide general utility, such as removal spells, counterspells, and board wipes.

It's important to note that this is just a general guideline. The best way to build a Commander deck is to experiment and find what works for you. There is no one-size-fits-all approach.
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