While this works great for venison shishkebobs, it also works on any cut of meat. I've been using it with flank steak lately. I just throw the whole thing into a bag and let it sit in the fridge for at least four hours and up to overnight if I'm on my game. This marinade can be salty so you won't have to add extra seasoning to your meat once it's done.
Olin's Meat Marinade
3/4 t oregano leaves
3/4 t powdered mustard
1/3 C light olive oil
2 T. vinegar
1 t onion salt
1 t celery salt
3/4 t garlic salt
1/2 teaspoon black pepper
Heat all ingredients to boiling point. Let cool. Pour marinade over meat. Refrigerate for at least 4-6 hours or overnight. Cook meat on grill to your preference.