Lord Arth, Knight of XIII

Whenever you cast a historic spell, return target
creature card with converted mana cost 3 or less
from your graveyard to the battlefield.
(Artifacts, legendaries, and Sagas are historic.)
When Lord Arth is put into a graveyard from anywhere, exile it, then you gain 4 life.
Ardent Guard (Sacrifice this card: Target Knight
gains indestructible until end of turn.)