and, if you want to get creative, kidney can be ok, but it takes some work to get it there. I went through a phase one season where I was trying to figure out how to better use the Kidney. I brought one to a chef at a neighborhood pub and he cooked up some tacos with it that were pretty good, but it took a lot of preparation.
All things considered, seared or sauteed heart at medium rare might be the single tastiest cut of meat on an animal. I like liver but I have to be in the mood for it. Its also a pretty delicate organ and doesn't store in the freezer super well, especially long term. I have a friend who has some iron deficiencies and eats liver once a week for health reasons. I usually try and give most of livers to her, but I do like to make dirty rice every so often with it, which, if you are unsure about cooking and eating liver, is a really good option to try.
I've made homemade blood sausage before using pig's blood that I can get from a local Asian market. Blood sausage is addictively good, though kind of messy to make. I always say that I'm going bag a doe with a base-of-the-neck headshot and drain the blood into some containers to make venison blood sausage, but, in actual practice, I don't like the idea of taking a headshot. I also don't really hunt anywhere where it would be convenient to actually do this. I'd need a 4 wheeler to get a ungutted deer out and sterile milk jugs that have been prepped and ready for use. Maybe one day.