Usurper

You can't win, you have to steal the crown.
When you finish off the King, you gain the King
role and 10 life. The past King goes to 1 life,
9 poison counters and they gain this role. Then until
that players next turn, their life total can't change
and they gain protection from everything. All permanents that player control phase out.
Enemies: King, (Knights, Barbarians)