What are the chances that Dragon's Maze will be predominantly mono-colored? It's a small set and all ten guilds will be represented; but there's also the guildless out there building up to something... Additionally, it would be a lot easier for the guilds to have an allied-guild represented in a "mainly-mono" booster pack. Thoughts?
I'm predicting hybrids and mono-colors in order to facilitate the semi-randomized 3-color groupings. Interestingly these 3-color groupings will facilitate a trio of guilds. It wouldn't make sense to create 3-color golds. In a given pre-release deck, you would be able to effectively use 1/10 golds. Monos and hybrids would be the most versatile. Tri-color hybrids would be another story...
I prefer gold to hybrid however, they get more interesting effects since they don't have to worry about breaking the color pie. A few more hybrid cards would probably be welcome though.
But monocolor? Less likely than tricolor. Sure, there'll still be monocolor cards without a doubt but I don't see them dominating the set. While it wouldn't be the first time the third set features new mechanics, past occurences were large 200+ card sets while DGM is a small 155 card set. I'm expecting a top off for each guild, a few more cards of different rarities and color identities that help fill out each guild's list of tools.
We must remember that two-thirds of the limited card pool are going to be DGM packs, while only the selected guild and secondary guild pack will draw cards from RTR and GTC, thus making their presence in DGM comparatively small. That means DGM has to stand on its own as a set for limited and that means each guild has to have at least a few cards of their appropriate colors. Although, splashable monocolor cards would make two-guild decks easier to run, but it just wouldn't be as much fun if there weren't still an ample supply of gold and possibly hybrid cards to play.