I will illustrate a simple example. If we have a 100x100x100 Rubik’s Cube,

then if you used all the matter in the Observable universe to construct Lots and lots of 100x100x100 Rubik’s cubes such that at least one of these Rubik’s cubes exists in the Observable universe representing each and every possible permutation that can happen, this would be impossible

More permutations exist than plank-volume cubes can fill the Observable universe

Ok then let’s expand the size of the universe to large enough that we can cover it with plank volume 100x100x100 Rubik’s cubes representing every permutation of a single 100x100x100 Rubik’s cube...this universe would be way too small for a GoogolPlex sized Rubik’s cube to be filled by enough rubik’s Cubes depicting every possible permutation of it

And as you keep expanding the universe to make each case possible, you can always then use ALL that space to construct yet a larger single Rubik’s cube whose permutations depicted in other cubes would be much larger than that universe

Hence, if something can happen it will happen requires an infinite universal size