Spectral Duke Dragon

:If you have a "Black Dragon Knight, Vortimer" in your soul, this unit gets +1000, and if your opponent's vanguard is grade 3 or greater, this unit gets +1. :At the end of the battle it attacked, [ 1 & retire three rear-guards], this unit, and it gets drive -1 until end of turn. If your damage zone has four or more cards, it gets drive +1 instead of drive -1.