With sufficiently-upgraded Bombots, you can pair them with Deep Borer, Anu’s Sceptre, or Apothecary to get fast wins. Machinist Hero, fully traited, speeds things up even further.
I’ve been using a Bombot team as well. One cast at my level usually results in a team wipe, if not the Mechanist or Flame Cannon mops up.
Deep Borer***
Bombot
Mechanist*** w Imperial Jewel
Flame Cannon
+2 Brown Banner so Bombot can cast after a single brown match.
Imperial Jewel catches the other colors and usually performs the cleanup. Deep Borer provides brown gems if the starting board is bad. Flame Cannon is mainly there for the extra Adana + Mech bonus (total +10 armor) and provides extra AoE if need be.
If I get a brown match on turn one, explode Bombot on turn two and it’s Good Night Irene! Mechanist will finish on turn 3-4 if there are any survivors left.
EDIT: My Bombots are Epic and I have all +2 stat Kingdoms except for the two newest ones. Bomb detonates for 35 AoE.
Valk, Rowanne, Prismatic Orb, Mercy, Dragon Banner, for speed clearing Normal explores. Buff Rowanne once with Prismatic, then cast her for a clear. A good lineup for Mercy at the start often produces a first-turn clear, and having Valk means it also farms souls for working on 5* kingdoms while you’re at it.
Maw, Valk, Justice, Mercy, Lion Banner for consistent Warlord 4 clears to break up the Seal grind. Use Maw on whomever is strongest just to get things rolling, use Mercy and Valk as needed to keep Justice full, and spam Justice on skulls as often as needed to clear (and again, also works for soul farming at the same time). It won’t always give you extra turns and it’ll often give the enemy skulls, but once Maw eats someone he can easily tank a few hits. It’s sometimes a close win, but I’ve never lost.
I use Valkyrie, Rowanne, Rowanne, Mercy for hard farming. One difficulty higher works too
I use the lion banner.
A good mercy/Valkyrie cast makes this team very fast. Just use Rowanne skill twice in a row (hence two of her on a team) and it kills all enemies on hard
Bombot deals 25 damage on cast and fill with just 1 brown match of any kind (due to fast from mechanist’s clockwork (3rd trait)
I chose to use Daemonomicon in that once in a while (about 1 in 20 or so games) there are no brown matches on the board and an enemy troop with huge (like Jarl) and since bombot dies on cast, the Daemonomicon fills the hole with a troop (that most importantly doesn’t use brown mana) so that if jarl survives with 3 life (it has happened once) you can still have an offensive presence (although the it is often not needed as the hero can often finish the job, but better safe then sorry)
…also, don’t forget to equip your hero with the perk that has him count as a mech, so that he can have a fast bonus too