Jund: With Jund, you have two main options: first, you can embrace the ramp theme, improve the finishers, and play a good-stuff / ramp deck
For four mana, you get a Black, Red and Green 3/3 with haste that allows you to create a tapped treasure token whenever a creature with haste attacks
So, let's start there: Top 10 Non-Creature, Non-Land Permanent Repeatable Loot Effects For Hashaton or Captain Howler Mask of MemoryMask of Memory Daretti, Scrap SavantDaretti, Scrap Savant Teferi, Master of TimeTeferi, Master of Time Key to the CityKey to the City Hazoret's MonumentHazoret's Monument Collector's VaultCollector's Vault Smuggler's CopterSmuggler's Copter Shorikai, Genesis EngineShorikai, Genesis Engine Mirrodin BesiegedMirrodin Besieged Chivalric AllianceChivalric Alliance While that's not the deepest pool of good options I've ever seen, there are still some options here
Key removal tools include: 5-cost Garp: Provides removal and synergy with Blacks cost reduction mechanics Meteor Volcano and Jet Pistol: Help keep the opponents board clear Borsalino offers early-game resistance with blocking capabilities
7 Furnace Punisher Menace isn't a keyword that you see very often in red, and there's a good reason for its scarcity