Berserk deck built around
Hero of the People and
Haunting Scream. The idea is to hold onto Hero until you can stack her with a bunch of battle skills and do huge amounts of damage with berserk.
Crownwatch Paladin and
Unseen Commando are the best cards to drop on
Hero of the People, especially by doing it with
Haunting Scream.
Dusk Raider's Inspire makes it easy to get berserk (and then reckless when you use berkserk) on any of your units for an even bigger Hero, with
Gift of Battle being a backup plan for if your Raiders get removed. Paladin's aegis gives Hero protection from removal, and Commando stacks his additional damage twice when she goes berserk.
This is a budget list so I included only the most essential Rare cards, but it can be made more consistent with Merchants and Crests. See this list:
Feln Hero
Other than that, Paladin Oathbook is a good way to pump up the size of your combo, since it behaves like Unseen Commando in relic form but gives permanent bonuses. I haven't played with it thoroughly but it is a successful card in other JPS Berserk decks, so a copy or two in the main deck couldn't hurt. If the market could fit 6 cards I would definitely have one there. If you want to cram it in the market anyways, you can give up Hooru Banner.
I hope this helps! Good luck, and have fun!