My take on Kennadins based on LightsOutAce's list (https://eternalwarcry.com/decks/details/SIjdbgBl044/kennadin).
The first substantial change was that I wanted to move away from
Assembly Line in favor of cheaper grenadins. More often than not you find
Combustion Cell off of
Ixtun Merchant and you need a one or two mana grenadin producing card to be able to play activated tribute cards a turn faster. I've found
Tripwire Grenadin is well positioned due to the prevalence of tokens and aegis in the current meta.
Kaleb's Intervention has nice interactions with the deck on top of it's normal functionality.
The other major change I made was adding
Jotun Feast-Callers which gives the deck something proactive to do when you don't have a cell or your opponent doesn't play any good targets for
End of Hostilities or Kenna's killer. It also serves as a target for
End of Hostilities, tends to bait out removal to clear the way for Kenna, and sometimes forces a trade activating tribute.
In the market, I prefer
Bore for relic removal because it's unconditional and answers all relics while cutting through face aegis. I'm looking into replacements for
Gearcruncher as it was already the weakest card in the market and the grenadin count is lower without
Assembly Line.
Jawbone Greatsword is just included since I opened one and wanted to play with it, it's been ok but could easily be replaced.