Mass removal is everywhere, and running something like Golgari Charm, Rootborn Defenses, or Akroma's Blessing can be a nice way to keep your stuff alive
Overmaster is the best, followed by some haste enablers, then a bunch of effects that you might not care about other than the draw effect ( glances significantly over at Warlord's Fury )
Interestingly, one Domain Overlords list ran both Starting Town and Ultima, illustrating how different support tools from the set can converge in a single build
And check out our list of the most expensive MTG cards of all time.
Excalibur, Sword of Eden Were the cost reduction parameters more restrictive, I wouldnt recommend Excalibur, Sword of Eden
Across all your creature if you have 3 different "Powers" you have a "coven"