Darkterror, the Faceless Void

Haste
Whenever Darkterror, the Faceless Void attacks,
tap all creatures defending player controls with
less power than Darkterror, the Faceless Void.
At the beginning of your end step, return Darkterror, the Faceless Void to where it was
cast. If this was your command zone, remove {2} from the commander tax.