Whenever one or more creature cards leave your graveyard, all your opponents lose 1 life and you gain 1, which can translate into a win with the right setup
Beast provides plenty past his entrance to the table, too, with four strength and four willpower to help in challenges, and two precious lore points when he quests
Compared to clumsy effects such as requiring only Insects to be present in the graveyard or requiring a large number of Insects, the conditions are poor, making it difficult to use as a general-purpose Insect type card
Although Eshki's card doesn't name Dragon cards specifically, they are a major focus of how this deck is built out of the box
Carrion Feeder being a Zombie can also come into play when looking to bring back Gravecrawlers in some sort of Bridge from Below / Vengevine deck
But Go for Blood represents one of the most flexible cards in Boros Cycling precise because you aren't supposed to cast it most of the time