A mysterious book

On his front porch sat a small leatherbound tome. The word RULES was burnt into the cover.

Picking it up, John peered around. No mysterious old men or mischievous gods - not even a note from his grandpa explaining that it was a family heirloom. John shrugged and closed the door.

The first page of the book had a few lines written in archaic script.

To thee whomst e'er this book shall find,
The laws of earth thy hand shall bind.

Ignoring the mangled scansion, **** rhyme and hideous grammar, John pondered the poem. He immediately reached the obvious conclusion that the book allowed him to change the laws of the universe with stroke of a pen.