Xerath, the Magus Ascendant

Mage ({2}, {t}: This creature deals damage equal to
the number of AP counters on it plus one to target
creature you don't control. Active this ability only
during combat phase.)
Whenever Xerath activates an ability, you may
pay {u/b}{u/b}. If you do, copy that ability. You may
choose new targets for the copy.
"I will be free."