There is a lot of research I need to do, mostly in Gatherer. Here is the work to date.
1. I went through the legendary creatures in Modern one by one looking for what seem like good Commander format commanders. This is a very subjective selection. I mostly took cards that had a low enough casting cost and obviously powerful flavor text. Also, I took cards that didn't have the obvious flavor text that does not work for a commander, such as "sacrifice [this card] and something great happens for you in this game," or "During your upkeep [something great happens with this card]" because during commander play you will likely use your commander only a handful of times.
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2. I have counts for the 92 tribes in ISD+RTR standard as of the issuance of RTR.
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3. I have looked at all the rats in Modern. The rats are by far the most fun tribe there is in Magic. When we read the flavor text of Marrow-Gnawer (Champions of Kamigawa Legendary Rat!), it is nothing short of complete comedic genius:
" Tap, Sacrifice a Rat: Put X 1/1 black Rat creature tokens onto the battlefield, where X is the number of Rats you control."
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