Anomalous Void Drifter

{2}{b}: Anomalous Void Drifter gains hexproof
and cannot deal or receive damage until end of turn. Regenerate it.
As long as Anomalous Void Drifter is attacking a planeswalker, it can't be blocked.
If Anomalous Void Drifter deals combat damage to a planeswalker, exile it.