From the multicoloured cards, there are nine Izzet (blue/red), four Azorius (white/blue), four Boros (red/white), four Simic (green/blue), three Dimir (blue/black), two Selesnya (green/white) one Rakdos (black/red), one Gruul (red/green), one Selesnya (green/white), two Orzhov (white/black), one Golgari (black/green),one Jeskai (blue/red/white), one Grixis (blue/black/red)
The downside of not being able to cast the cards from your hand isnt much at all when paired with a low curve where Experimental Frenzy is the last card cast
It's one of the more blatant instances of all gain for the company, not for the players
As Gavin Verhey explains, there are four Commander decks in all, and each deck comes with at least two different creatures that can command that deck, and for this set, you have your choice of a hero (each of the four heroes are in an adventuring party) OR a fearsome monster