Can be used as one whole fodder for ritual summoning.
Very low stats.
Ritual Raven can be used as a ritual summon fodder for DARK attribute ritual monsters such as Zera the Mant, Garlandolf, King of Destruction and Garma Sword. It's usually more recommended to use other monsters since ritual cards need at least 3 cards. Drawing this instead of a usable monster can lead to a dead draw.
About half of the ones that exist IRL. (Admittedly, most of the ones we have are non-effect monsters or Relinquished, who clearly doesn't need Ritual Raven, but there's a couple like Garlandolf and Zorc.)