In terms of writing mechanics, you're mostly solid grammatically, but there's still some ironing out to do when it comes to style. Here are a few examples:
When a human, henceforth referred to as the master, views the front side of the card, the master becomes obsessed with control, authority, and power.
There are a few things wrong with this sentence: one, it's unnecessarily long, two, why the hell would a researcher call an otherwise normal human being "the master". One of the challenges of writing an article is in trying to juggle different general "characters" like you're doing here without actually naming them; people often resort to unnecessarily designating them as -1s or -2s or calling them "the subject" when they really shouldn't…
Anyway, you could reword like:
Those who view the front side of the card become obsessed with control, authority, and power.
I'd try rewording things so that you don't always have to refer to a "target" also.
By picturing an action in their mind, the target is then able to follow the "picture"
This is not clearly written; it's not that the target can follow the commands, it's that they have to. Furthermore, "to follow the 'picture'" is confused wording. Pictures aren't things you follow.
Because you have a solid grammatical base, shoring up your stylistic problems shouldn't be that difficult to pull off.
When it comes to the idea itself, I'm not really sold. Right now it's literally just a mind control device with the faintest hint of a story tacked on; this faintest hint of a story is too insubstantial to have any impact on me, so I'm just left with the mind control device—which SCP-209 already kind of does better (although, looking back, those are some quality Series I stylistic "quirks" that you should not emulate, ha-ha…) it's hard to talk about your idea because it's so bare-bones right now; while short articles can work, they often have powerfully evocative ideas, be they weird, creepy, interesting, whatever, behind them in the first place. A mind control device can work, but it's not powerfully evocative on its own; you need to do a lot of work on your part to make the idea interesting.
