Jund fills the board with cheap, low-toughness creatures (Gene Pollinator, Greedy Freebooter, Callous Inspector, Umbral Collar Zealot), making Pick Your Poison's -2/-2 sweep mode far more efficient and flexible than Vicious Rivalry, which also costs you life you can't spare against an aggressive curve. Pick Your Poison can alternatively pump your own Armus or Overlord of the Balemurk if the board state calls for a bigger threat instead of a wipe. Keep Requiting Hex and Theorix Charm in as cheap, efficient removal for their small value creatures, and hold Spell Snare for their two-mana plays like Biotech Specialist.