Grisbrake Harbinger

Mercenary spells you would cast cost {1} less to
cast.
{b}, {t}: Search your library for a Mercenary card
with converted mana cost 1 or less, reveal that
card, and put it into your hand, then shuffle your library.
"Mercenaries are scattered all throughout Grisbrake,
most of which are searching the areas for dangers that
need to be neutralize." - Harken Krieg