Join the Adventurer's Guild

When this faction enters the battlefield and again whenever a creature you control fights, put a
rank counter on it.
When this faction enters the battlefield or when
you put your fourth rank counter on it, search
your library for a creature card with mana value
equal to or less than 1 plus the number of rank
counters on this faction, and put it onto the
battlefield. If it was legendary, you gain life equal
to its mana value.