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Why focus on two colors and limit what cards you can draft when you can easily go 3 colors and just have more options
Since cards printed in Commander decks are playable in Legacy formats (and also show up in spikier casual formats like Cube), players from those formats snapped up the precons, leading to shortages and decks being sold for well over MSRP
For example, you may find a card that's black, green, and blue as the black card and still find a green card and a blue card
You could also look to use spells that exploited your milled opponents like Spelltwine and Memory Plunder
With a 2/2 body, when you draw that second card each turn