Mono-Black has access to a lot of cards that benefit from multiple swamps being controlled, and since you're in a Mono-colored deck, nearly all your lands will be just that
What I like about Breath of the Sleepless is that giving your Spirits flash feels different than other tribal enablers, just like Necroduality's ability to Clone a non-token Zombie is pretty nice and unique as well
Heres my game plan for you: Figure out what type of collector you are
The games vast array of monster types, playing styles and summoning choices spread across an assemblage of over 10,000 unique cards is a dazzling display of Yu-Gi-Oh
When an MTG Battle card is played, its controller chooses a player to be its protector (there are restrictions on this depending on the Battle type)
Sacrifice it for a card and keep on, or just use it for creature things like attacking, blocking, and grabbing a piece of equipment