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I appreciated the effort and rewarded him with the victory; he probably builds mage decks himself.
I had something similar happen to me in the first week. We were battling on dragons, and I was kind of leading, even managing to set up my own mill deck, but I was just a bit short of having a flying creature. Then he healed up to 20, and I started losing card advantage. When he already had a flying creature on the board, I took turns playing and attacking with Dreadquinn, Zeus, and Dehak on 18, and only then did I realize that it wasn't a one-shot. But he had already started conceding after the Dreadquinn, so I got lucky.