Of the Fallen

Indestructible, patronage. (When this card enters
the battlefield, search your library for a
warlock creature card and put it into your
hand. This card acts as if it were an enchantment
unless you control a warlock)
Warlocks you control have "{3}, {t}: You
gain 1 life or your opponent takes 1 damage.
"Those who give to darkness find me"