Who or what had worked this seemingly major miracle?

I wasn't about to question this major miracle.

Sara's Center does not win them all; keeping most of them afloat seems a major miracle in itself.

Barring a major miracle, Boros knew her life was over.

The second major miracle occurred in 1815, three years after the disastrous fire.

Barring a major miracle, the Giants are dead in the water.

Well, as it happens, by what is no doubt a major miracle, you are essentially correct.

The first major miracle attributed to the image occurred in 1623 when a child was revived after being accidentally stuck with spears.

If we can do it again it'll be a major miracle, no less.