In Commander, picking the right legendary creature to lead your angelic battalions is a big deal, so having all your options available is vital if you want a strong deck
Bigfoot!" RA03-EN019 (QCScR) "Danger
In addition, you could also lump Bob in with other cards that see play in multiple formats: Vendilion Clique (#3), Noble Hierarch (#2), and of course Tarmogoyf
You can copy Biovisionary to get closer to your win condition, or you can copy creatures that reduce your spells costs and storm off
The mana is a little unstable, in that there are only thirteen black sources and there are five lands that dont cast Steel Leaf Champion, but Glowspore Shaman and Llanowar Elves both help with casting Steel Leaf Champion and you dont strictly need black early
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