But fail to actually explain what tax Canada currently has in place that results in owners of multiple homes being taxed more based on how many homes they own.

I would not explain that as we have no such tax of that shape, nor has the conversation ever been about such a tax. Your logical fallacy is ill-conceived.

Other commenters have specifically named the taxes we do have. I’m not sure stealing their thunder adds anything. Did you somehow forget to read all the comments before you thought flailing around like one of those whacky blow up men things you find at the used car lot was a good idea?