Take my Mono-Black Commander deck built around Nether Shadow, Ashen Ghoul, and such
That'd be great on its own, but Ancient Cellarspawn also causes an opponent to lose life equal to the difference between the mana you spent and the mana you should have spent without all the discounts
In terms of raw playability, I'm curious to see where it will land
When that happens, the player whose turn it is takes the initiative
Brotherhood Regalia Brotherhood Regalia isn't exactly another Swiftfoot Boots, but it has excellent utility, primarily with commanders that leverage the unblockable ability like Yuriko, the Tiger's Shadow and Kaalia of the Vast
Hate-Bears & Protection The crux of this deck is playing creatures that can beat down your opponents while also disrupting their plans on some level