This deck is a lot of fun. When using a single large set, there aren't enough creatures for a solid two-color deck, yet with three colors, you can make a viable deck.
I played a dozen or so solitaire decks, and the deck is very stable. I am not playing it against anyone on MTGO because I am going to lose in four turns every.single.time. MTGO commander decks are really strong. This is a casual, fun build with cards I recently pulled from just one set.