Instead of buying PCGamer, for the Totem of Origins, you can get one without buying it.
I guess there were some faulty codes in their magazines so you can request another. No proof of purchase necessary.
Send an email to [email protected]. The title should be "AOC CODE REQUEST". Write whatever in the body, I heard you can leave it blank.
Took 3 or so days for them to get back to me. Got a code and it worked on my AoC account.