Have you considered the new HOU
desert that can do blue mana -
Desert of the Mindful, comes in tapped, but cycles for 1U.
Hollow One will be a house.
What about
Abandoned Sarcophagus? 3 mana artifaft from HOU that lets you cast cycled cards from graveyard, secondary effect of exiling ANY cycling card that goes to the graveyard any way that isn't cycling, so it wouldn't mesh well with
Countervailing Winds.
I've never played a serious
counterspell deck; don't they usually work best with more than 24 lands? I would think cycling costs would make this more important.
Monocolor decks are cool; thanks for sharing your idea!