Seeker

Allomancy (Seeker enters the battlefield with three
metal counters on it)
As long as Seeker has at least one metal counter,
spells you cast that target creatures with activated abilities cost {2} less to cast.
{t}, Remove a metal counter: Until end of turn, creatures your opponents control with hexproof
can be the targets of spells and abilities you
control as though they didn’t have hexproof.