That seems to take a crap on any deck that runs lots of creatures, which already have the short end of the stick compared to control in EDH
You can remove one of those counters to deal one damage to any target
95% of the time, the triggered ability probably isnt worth a removal spell thats going to be better sent towards Rhystic Study or Smothering Tithe, but once enough cards have been exiled, the risk from rolling a 20 is going to weigh on your opponents
Silver Myr and Ornithopter of Paradise are more traditional mana dorks, tapping themselves to add mana, and Urza, Lord High Artificer can tap artifacts for blue mana
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Each color was represented twice