So, here's the thing:
Keelo, Bold Innovator is a sweet card, and a powerful value engine. So is
Evenhanded Golem. So, what do you get if you mash the two together? Piles and piles of sweet, sweet vaaaaaalue. Been playing in Masters to roughly even results - most losses are to Skycrag Yetis, hence the removal package, but there's also been a decent amount of the mirror (where Defile is pretty necessary to kill opposing Keelos).
One other nice perk of Keelo is that she's an excellent Tribute enabler, turning on
Aeva, Eilyn's Elite,
Aurapiercer, and
Sheriff Marley. Even better, the
Cloudsnake Hatchlings that Aeva gives you can be Keelo'd back into more Evenhanded Golems! A beautiful cycle, and one of the stronger synergies in the deck. Keelo is very capable of taking over a game if left unchecked, which is pretty good for a 2-drop.
The other units are largely chosen based on whether they have an even (preferably 2, but occasionally 0) number of battle skills and how much value they can generate. After that, a bit of ramp so we can activate Keelo more often (and play out all the cards we're drawing), and a pile of removal to deal with aggro. It may be appropriate to adjust the removal package depending on what you're running into.
Still an early build - Whispers of the Throne only came out today. I'm not entirely convinced that
Felrauk the Outcast and Mokhnata, Restored should be in here, but
Svetya, Merciful Orene is gas despite not being super heavy into Justice - both giving future Keelos Aegis (so she actually lives more consistently) and letting us cash in Evenhanded Golems and Blightmoth Shades for enormous
Icaria, Valkyrie Captains.
Annihilate
x3
2
Copperhall Porter
x2
2
Defile
x3
2
Eremot's Designs
x2
2
Evenhanded Golem
x4
2
Icaria, Valkyrie Captain
x4
2
Keelo, Bold Innovator
x4
2
Lost Scroll
x4
3
Blightmoth
x3
4
Aeva, Eilyn's Elite
x4
4
Deathstrike
x2
4
Honor of Claws
x2
4
Rindra, the Duskblade
x1
4
Sheriff Marley
x1
4
Vara, Vengeance-Seeker
x3
6
Aurapiercer
x2
6
Black-Sky Harbinger
x2
6
Felrauk the Outcast
x2
8
Mokhnati, Restored
x1
8
Svetya, Merciful Orene
x1
Justice Sigil
x4
Primal Sigil
x3
Shadow Sigil
x3
Crest of Cunning
x2
Crest of Order
x2
Crest of Vengeance
x3
Seat of Cunning
x3
Seat of Order
x2
Seat of Vengeance
x3
View Deck on Shiftstoned
Then I tried Vara as the big payoff, with a few different dragons in the 4 and 6 slots that work very nicely. Karvet is also very similar to aeva, in that you can use the "token" to get a Golem, but Karvet can also be sacrificed to Keelo. I kept having lots of issues when I included creatures that I could not sacrifice to Keelo.
I just posted my Vara version if you want to check it out.
You really, really want Strategize. Not only does it help you find your Keelo's early, it also sticks your random 8-cost duders back into the deck where Keelo can get them.
Copperhall Porter is not good. Its body is close to useless; feeding it to Keelo doesn't bump you up the ladder; and I'm often running out of Justice Sigils because of Icaria.
Felrauk is almost never what you want to be doing.
Ripknife Assissin is strong defensively and offensively and lets you ramp up the Keelo curve, but I ended up using Stalwart Silverwing in the Porter slot instead. It's a little easier to play since the influence is slightly imbalanced towards Justice, and more importantly, it ups the Svetya-boost count.
I don't think Tranquil Scholar makes sense here, since it itself can't be chained into another card, which sort of defeats the purpose of running it in the first place.