Many of these decks dont rely on any specific cards from the graveyard, so I wouldnt bring it in unless youre really wanting to target specific cards
Bloodforged Battle-Axe is great because the tokens all give Steiner +1/+1
Token creators like Herald of the Host and Serras Guardian synergize with Kaalias aggressive tempo
Suddenly, your army of tiny goblins actually removes your opponents creature when they try to block them, making you much more of a threat
Unfortunately, with only a couple dozen split second spells available, and no synergistic payoffs for using them, they're a niche tool they see limited use
Black's tutors allow you to ignore this by searching for any card you like, completely unrestricted, and placing it directly into your hand, or on top of your library