I just read your post. And it's true, I will also probably use Night Reaper if it's in the EARTHQUAKE Ruleset.
I've also been defeated by Night Reaper in the EARTHQUAKE Ruleset while using VOID DRAGON. My plan fell apart because VOID DRAGON was not assisted by healing abilities at that time.
I have played against that set up and have been countered by Void Dragon + Venari Crystal Smith. On the other hand, I don't have Void Dragon myself so I use Uriel or Pelacor Mercenary as my tank depending on the mana requirement.