Switching out a few cards that have felt fairly underwhelming with more potent support, and bringing the power level of the rakdos counters deck down a little bit - it's very hard to stop the rakdos deck if they have a strong start, and the speed that dreadhorde butcher gets online was a big part of that. Slowing the deck down a little bit gives other decks a chance to keep pace. Juri also plays more into a sacrifice theme which is supported by various morbid cards and sacrifice outlets, and so ends up having more interesting synergy.