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This is my casual Commander Cube for Deckbuilding. I use it to build new Commander decks, so that I can bring something new to the table.

In addition to the legendary creatures in the cube itself, I keep a pile of three-color legends to use as commanders off to the side.

Oh, and before I forget, I try to keep the price of the individual cards in this cube to $3ish or less.

Check out more details about my cube, here:

http://ayecommander.blogspot.com/p/commander-cube.html

The Top 50 List is a great place to look for Commander Cube cards:

http://www.mtgsalvation.com/forums/the-game/commander-edh?filter-prefix=45

Another great resource is this statistical breakdown of the Commander metagame. Open the "Out of curiosity..." section and choose, "Top 50 - by color."

http://www.mtgsalvation.com/forums/the-game/commander-edh/204274-statistical-breakdown-of-the-commander-metagame

Check out the "most popular" Commander cards at Metamox for more Commander goodness:

http://www.metamox.com/commander/

And, there is this:

https://edhrec.com/cards/?q=