Is it safe to eat venison tartare from an animal that was harvested in the wild?
If you really want to eat that raw, freezing the meat at -4 deg F (-20°C) or lower for 30 days or more should kill most if not all the types of parasites found in deer.

Different parasites die at different temperatures, for example:


Anisakiasis (fish worms) can be treated at -4°F (-20°C) or below for 7 days (total time).
Trichinellosis (pork worms) treated by freezing pork less than 6 inches thick for 20 days at 5°F (-15°C) to kill any worms. 
Venison -4°F (-20°C) or below for 4 days.