So what changes will you be making to your decks from the upcoming Guilds of Ravnica set? These are the ones I will at least initially play-test and see how they fit what the decks want to do.
Sidisi
* Lazav, the Multifarious- will test play it, curious to see what interesting interactions I can get (though I'm thinking of building a Lazav deck and I try not to have my generals in other decks)
* Underrealm Lich- Will replace
Taigam, Sidisi's Hand; fits the deck theme of Zombie tribal and I like the first ability better than Taigam's
Tajic
* Tajic, Legion's Edge- Seems like a good fit preventing damage to my tokens
* Chance for Glory- More fodder for
Sunforger* Divine Visitation- Turning my other tokens into 4/4 Angels tokens with flying seems pretty good, at least enough to play-test
Skullbriar
* Golgari Findbroker- More recursion, a little harder to cast than
Eternal Witness but will get play-tested
* Pelt Collector- Fits the +1/+1 counter theme
* Guildmage's Forum- Again, fits the +1/+1 counter theme
Purphoros
* Legion Warboss- Pretty good trigger for the deck...hopefully
Yahenni
* Plaguecrafter- Seems to fit the deck, we'll see
Animar
* Beast Whisperer- more card draw for doing what this deck wants to do anyway
I didn't include Assasin's Trophy because that seems like a no-brainer to at least be play-tested (if not an auto-include) for any deck running those colors.