This is my tentative decklist for Game Day. Looking for feedback! I am not too sure about Kalitas in the main... Not sure if I am too light on threats...
Sideboard is just a list of possible SB cards, or maybe MB if I make changes.
A couple things that I would personally do is move Liliana, the Last Hope to the sideboard. She is great in some games but not in all of them. I also see that you have 0 Fatal Push in your main board. The card is just too good to run 0. At minimum I would run 2 in the main and 2 in the side. Glorybringer is a threat I would consider as well; it is just too good. You could put 2 in the Main and 2 in the side. Good luck with your deck!
I'm working on a b/R control deck as well. Here's my current list. I'm actually not playing any Liliana, because I feel like the card advantage from Chandra is just better, we don't want to mill our own deck, and we don't have enough creatures to hit with Liliana, the last hope. Chandra, Flamecaller is so good in the deck. It is card advantage if your hand is empty or you have no cards you want to hold in your hand, and it's also a really fast clock. Mind if I ask why you chose not to play Glorybringer? Also, about kalitas, traitor of ghet, it is fantastic mainboard in my testing so far. I'm playing cut // ribbons instead of grasp of darkness currently because I'm just testing it out.
If you have any questions, feel free to ask!
Sideboard is just a list of possible SB cards, or maybe MB if I make changes.
https://www.mtggoldfish.com/deck/647730#online
If you have any questions, feel free to ask!
Also, if you haven't seen it yet, here's Alexandre Habert's pro tour R/b control deck. It went 7-3 in standard.