It's fine. And maybe I wasn't being clear when i made my statement previously. Whenever I build a deck I try to stick to the plane that the majority of the deck's core focuses on. Since you're running prossh i would recommend using mostly cards that come from Alara (which is modern), however you don't have to be restricted to just that plane to build a good deck (especially in commander). I say this because often times people add cards to their commander decks to fill up space without actually having all the cards contribute to the overall theme or purpose of the deck. They'll take cards from every set they can think of but some blocks and their cards are tailored to certain in-game creature mechanics. That's why playing in a certain plane shows you new ways to use cards from other planes in new and creative ways
Also there's nothing wrong with having a sacrifice based deck, in fact i run one with the new
Ob Nixilis reignited and it works pretty good for a standard abzan deck (you can check it out if you look at my deck list on my page). My only thing is make sure you have enough creatures TO sacrifice (or steal your opponent's using
act of treason). Reason being if you have three or four cards on the field that ALL say sacrifice to have a certain effect happen then you're sitting there
wonder "what do i need to keep and what can i afford to get rid of?" Not saying you would have this problem but it's something to keep in mind while playing other decks.
Lastly to take care of that behemoth of a commander try playing red burn/black destruction spells that also
EXILE creatures. You can also play
archetype of finality to
cancel out the deathtouch aspect of his deck and give it to yours. That way if it's toughness gets 3 or lower you could always
annihilating fire it and
exile it from the game. Take into consideration that you're playing Jund, a 3-color deck designed for aggro and battle tactics. Using cards that deal lethal damage whether they be
blazing hellhound,
fiery conclusion, or even
burn away would be advantageous for you to add to this deck. Also adding black cards such as
deadly allure (because both colors in it's regular and flashback cost are in your deck) would work well for you. Just think of it this way; 1) how does my opponent play, 2) what cards are he he/she using to make it happen, 3) what are cards that work in the complete opposite to his/her plans, and the most important 4) how can I make those cards work COHESIVELY in my deck. Think on it for a little bit an let me know what you think OK?