Have Darksteel Forge on the field to protect both the angel and the equipment from targeted removal
Arthur, Marigold Knight is a fine commander
Lord Skitter, Sewer King Lord Skitter, Sewer King can be a nice bit of graveyard hate, and its consistent token generation can be very powerful in rat decks which often benefit from having more of the creature type on the field
Hoopa ex Greninja Using only Dark energy, ideally start with Hoopa to start dealing early damage and also targeting those in the bench which can easily be whittled down by Greninja later on
Discard and disruption By attacking the opponents hand early, black can slow combo decks and remove key answers before they matter
This means theyll keep going forever if uninterrupted, so you will need a sacrifice outlet of some kind to eventually turn off the creature tap