This one is pretty fun, but worked a lot better pre Death Mark nerf. I really liked Blighted Lands as a Kingdom when it came out, and had Venbarak in place of Des until she was released. Does well against those pesky yellow daemons like Gorgotha and Famine, however it is slow so I tend to try and rush Abynissia before Herald, board depending.
I find the Naga a cool race and the Assassin class is a blast, if not totally reliable. 
This team used to consist of Maralith in place of Viper and Prey Seeker as the hero weapon. Fill Poison Master first then fire off the Hammer and hopefully on the next skull match its a double with Assassin trait triggering 
Viper needs a buff though, currently only puts out 33dmg 
. Euryali summons fodder troops in if the hero gets skulled out. The team did do reasonably well during the Naga buffed week just gone.
Love Orcs, got even better with their once traits. I use this team for red day as the two summoners help to, somewhat, alleviate the carnage the dwarves can reap. Orc Veteran almost always generates reds as he has +45 attack. Gar’Nok isn’t at the back, as I normally keep Gargantaur charged until he can kill someone, so helps self looping. Can get stuck against teams that barrier up quickly (Dwarven Gate, Stormshield) as there s no AOE or splash damage.
Hmm, the Teddy Bears! Strategy here is to generate skulls with the Corrupted Urska, whilst Urskatyr buffs up to become the tank once the Corrupted one eventually suicides. Urskatyr with high attack and enrage make short work of the enemy when the skulls come your way.
Explode things, barrier up and do massive damage! Love this team, with either Bard or Oracle class, for yellow day. Depending on the starting board go for either Artema or Herdmaster then just cast what ever is ready. Artema seriously melts targets! Dawnbringer brings some defence and if there is no enemy Kraken I sometimes will place WB in 2nd spot.
Fun but random team, that really got caught in the Kraken nerf crossfire. Prior to that you could get multiple barriers onto your troops and max your gold count (which boots GnG’s damage and Pistol’s gem destruction) in one Rock Troll cast. Now not so, so it is a bit slower and less durable. Gog and Gud can one-shot troops when at full gold bonus, oh and Titan class is required to get everyone starting at half mana.
Built to take advantage of Tal’Rae’s double damage against webbed enemies. Tomb Spider’s double skull damage against webbed enemies is nice. Dark Maiden keeps the Spider alive and buffs it to get more damage when it gets sacrificed by the Queen. I’ll sacrifice the front troop also if it looks like it will die to get a new full health troop out.
This team does fall over as soon as you lose one troop, because then when you cast the Queen it’s on either the gem creator or main damage dealer so the team synergy gets screwed. I’m still trying to work the hero class in for it’s familiar trait to ensure the Queen does have some extra sacrifices.
Big Attack for War = Big Spell Damage for Queen Ysabelle 
Loads of entangle here which can hamper Gloomleaf attack steal, wish that they would change this as clearly the base attack value is ‘remembered’ so why not reduced that value instead of the entangled ‘0’? Yasmine is blocked, but once you have a troll cast there are more than enough greens around. Plus, once you weaken the opponents armour with Gloomleaf just leave him full and bathe in the self looping glory of Yasmine.
These are is somewhat of an order of what I deem to be fun. I also run most of the mono colour ones as Guild War teams too.
I try and build teams around troop type and/or kingdom, whilst covering most colours.
