Kasmina of Nahiri's Wrath

Whenever you cast a historic spell, Kasmina of
Nahiri's Wrath gets +1/+1 until end of turn. (Artifacts, legendaries, and Sagas are historic.)
Historic spells cost {1} less to cast as long as
Kasmina of Nahiri' Wrath is equipped.
{2}{u}{r}, {t}: Copy target activated or triggered
ability you control from a historic source. You
may choose new targets for the copy.