Austrin, Eternal Acolyte

Lifelink (Damage dealt by this creature also causes
you to gain that much life.)
Whenever a permanent you control is exiled, you
may put a permanent of lower converted mana
cost from your graveyard to your hand.
When a God creature or enchantment you
control is exiled from the battlefield, you may
pay life equal to it's converted mana cost and
return it to your hand.