Ravnica Allegiance is the second set in our (re)return to the planet wide city of Ravnica. This set brings the other 5 guilds back into the mix, each with their own color combination and special powers. (It also brings back the last five of the fetch lands…special lands that lets you go find one of two paired lands from your deck for the low, low cost of one life point)
Azorius: Blue and while combine with the Senate of the law. The Azorius special new mechanic is Addendum. These are Instants that have a special bonus surprise in the box if you cast them during the time you could cast a sorcery.
The Gruul (Red & Green) ‘s new mechanic reflects their aggressive ways. Riot gives you the choice to either bring in a creature in with haste so they can attack right away, or a +1 counter.
Simic (Blue & Green), the clan of growth has traditionally been all about tossing on the counters, and the new Adapt mechanic is all about adding on counters and once in a while throwing in an extra power or two for all creatures with counters on them.
The Orzov Syndicate (Black & White) brings in Afterlife, a mechanic that brings one (or more) 1/1 flying spirits when the creature dies.
Finally, we have the Mad Clowns of Rakdos (Red & Black). Their distributingly named Spectacle. When these spells are cast in a turn after an opponent has taken damage they get extra abilities.