Brenz, Auriok Remnant

This spell costs {1} less to cast for each of your scabbard counters.
When Brenz, Auriok Remnant enters the battlefield, you may attach any number of your
exiled Auras and Equipment with scabbard
counters to it.
When Brenz leaves the battlefield, exile all Auras
and Equipment attached to it and put a scabbard
counter on each of them that does not already
have a scabbard counter.