The creator ...
There is no evidence for a creator.
obviously
In what way is an entity for whose existence there is no evidence doing something, somehow obvious. It isn't.
shows self control
Evidence please - given that you have no evidence for a creator in the first place you cannot move to the stage of ascribing attributes to that entity.
by only performing the creative act once
You have no evidence that the universe was created by a creator - nor do you have evidence that the emergence of our universe is the only example of a universe emerging. There are plenty of theories (that are actually based on evidence and observation) that propose multi-universe solutions.
otherwise we would be knee deep in matter/energy
Why would that be the case given that matter and energy are conserved within a closed system such as a universe, so regardless of whether other universes exist ours would still contain the same matter and energy.
and the laws would be constantly changing.
Why would those laws be constantly changing - if they are fundamental laws they'd be constant and would apply in our universe, and other ones, in the same manner.
On Occam I think you have added six additional steps/complexities/entities that fall foul of Occam and therefore require you to justify their existence and necessity in a single sentence. These are:
A creator
That the creator has self control
That the universe was created by the creator
That the creation of the universe by the creator only happened once
That energy/mass are not governed by the fundamental laws of conservation in mult-universes
That fundamental laws are not fundamental in multi-universes but change.