Fafnir, the Dread Lord

Deathtouch
Whenever a creature an opponent controls dies,
put a gold counter on Fafnir, the Dread Lord.
When Fafnir, the Dread Lord has three or more
gold counters on it, exile it. Then, put a legendary
5/5 black Zombie Dragon creature token with
flying and deathtouch named Fafnir, the Dread
Dragon onto the battlefield.