Although Rakdos has now got some juicy cream at the top of its pile it has a sharp fall off in quality for the cube after about 7 cards and made the list really tricky
There are only so many creatures with those types out there, but there are several popular Commanders that care about them
(Each B in the mana costs of permanents you control counts towards your devotion to black.) Your opponents cant gain life
When you combine these with ways to exile cards to play in later turns, and the sheer force of constantly attacking, you can end up with a deck thats simply faster than most decks can deal with
For tribal decks, its a cheaper Omniscience, and considering how easy it is to loop Zombies while netting resources, winning with a combo should be just a step away
Frankly, the dies trigger makes it even more interesting if you pack your deck with strong ETB threats in this color wheel that come back again as a cookie version of themselves