I think that bbbbbbb comments are about the specific miracle mentioned in one of your posts. But point taken, if a miracle has to be rare to be true according to bbbbbbb then that is a rather eccentric definition indeed.
The truth is that the Eucharistic miracle, the real presence of the Lord, is a sacramental presence - it is no less real because it is sacramental - rather than a miracle of bread turned into meat and wine turned into blood. The body and blood of Christ are really present as the host and precious blood (within the chalice) but the host still looks like bread and the precious blood still looks like wine, in fact all of the measurable properties of the host and precious blood remain exactly as they had been when the host was a communion bread and the precious blood was communion wine (prior to consecration). It may be the case that in some specific cases meat and blood became visibly present, that seems to be the testimony in the case that concretecamper referred to in an earlier post. Such things are indeed uncommon, I've never seen such happen but I do not dismiss as impossible that such may happen in the sight of others.