Delighted Halfling
Opponent cast Yawgmoth, Thran Physician. I saw a colorless mana in the mana pool with no permanent in play to add colorless mana except Delighted halfling, with that in mind I know I can counter Yawgmoth, Thran Physician because opponent did not use the Delighted Halfing second ability. I cast Counterspell on Yawgmoth, Thran Physician and it still did not get countered.
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