The Top 10 Mana Rocks In Pauper Commander (in my opinion of course.) A "Mana Rock" is a non-creature artifact that produces mana and usually only costs colourless mana so it can be included in any deck.
Even if you don't play Pauper Commander, you can think of this video as 10 Effective Budget Mana Producing Artifacts at the Common Rarity.
If you want to learn more about this awesome low cost fringe format here is an in-depth explanation: https://www.youtube.com/watch?v=kjoIlTjFTtE
And here's a five minute version for those short on time: https://www.youtube.com/watch?v=tsWic_LxbTk
Notes/corrections:
4:50 (#7): Also commander games tend to last quite a few turns so it's not uncommon to net 10+ life from this card over the course of the game
7:08 Oops I'm used to the angle being a bit different so I didn't realize I put the card outside the bounds of the video. Sorry about that
