A couple more I thought of, Monstrous Onslaught sounds pretty good if Kresh has over 20 power, good odds of being able to 1-shot someone that turn. I'm not sure if it's 'too fast', but Chandra's Ignition would be pretty easy to win off of, you just need a big Kresh and to resolve your spell.

RockIV

Edicts! Mass Edicts! Fleshbag Marauder, Merciless Executioner, Demon's Disciple, Plaguecrafter & Gravelighter are all nuts in this build. I wouldn't recommend ones that cost more than 3, though. Soul Shatter, Vona's Hunger, Liliana's Triumph & Sheoldred's Edict do the same thing at Instant speed, with the tradeoff being less Counters on Kresh the Bloodbraided, as those are not Creature Spells.

Those cheap, 3-drop Elemental stompers are solid as well, like Ball Lightning & Lightning Skelemental.

I'd also recommend literally as many Dorks as possible, as they also pump Kresh when they die, they're utility at both the floor and the ceiling of your deck is undeniable.

Pestilence & Pyrohemia are also worth it for this Commander for the same reason mass Edicts are worth it: controlling the board and pumping your Commander at the same time is just a great thing to do.

More card draw couldn't hurt either, maybe a Beast Whisperer & a Dark Tutelage or something.

Cheers!

Been reading all the comments , so many cards. Thnks everyone, but decided to take Azoth2099 advice and added Fleshbag Marauder , Plaguecrafter , Merciless Executioner, Demon's Disciple and also Decimate and Rhythm of the Wild