Jon Snow, Lord Commander

First Strike, Hexproof, Lifelink
Whenever a creature you control dies, you may pay {g}{w}{b}. If you do, search your library for a creature card named Ghost and put it into your hand, then shuffle your library.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)