Uncounterable is a nice perk although not that frequently relevant
Being in black also opens this Jund commander up to some reanimation engines, which could make for huge plays with creatures that have strong ETBs like Craterhoof Behemoth
Playing these decks was a bit harder, as you needed to pay attention to which lands you were putting out there and the costs
They care about modified creatures, and its fairly easy to make a good army and attack again between +1/+1 counters and cheap equipment
(Quite literally, by the way.) #2 Pick Your Type The next step is figuring out what kind of discard spell you want to make
Whispers of the Muse (T1, Ext, S, Block) A favorite in "Turbo Xerox" (a blue deck which used minimal land but a ton of cantrips to thin out the deck), Counter-Phoenix (Shard Phoenix + Forbid) and Tradewind-Awakening (put Awakening on the stack, tap all your lands for mana, untap all your lands), Whispers has what might seem like a hefty price to pay for one card but you get to do it turn after turn after turn