Whether you're a seasoned commander or a total beginner, it can be difficult to know where to start your bargain hunting as there's so many MTG card sets and accessories out there
I dont think you can or should build around this, especially when five-color decks have so many fun things to do without it
Notably, it doesn't need to be the same legendary Assassin you controlled when the ability initially triggered
For instance, Arid Mesa can be sacrificed to search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle. While this can be used for basic lands of the stated types, it can also be used to fetch nonbasic lands with the given types
I also like the idea of using Tortured Existence to make a 1/1 flying token for each B spent
Then it can help you to draw a card