The Dynamo were working with just 10 men in cold conditions after Jermaine Taylor was handed a red card in the 62nd minute, seemingly on their way to a sure loss.
But Kofi Sarkodie redirected a corner kick toward the net, where midfielder Creavalle put it past TFC goalkeeper Joe Bendik in the 94th minute.
The Dynamo ran its record to 4-2-1 with the result.
Jeremy Hall tallied for Toronto (1-2-4), which settled for its fourth straight draw but remained unbeaten at home this season.
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