That could work too (I see some problems, but I don't think they're insurmountable). I probably wouldn't be able to help with this idea as much myself, since I don't keep up with any format where the cardpool rotates...
Some potential issues...
The victim, uh, I mean player not being able to acquire the cards for the deck in time...
Could be solved by proposing multiple solutions as well as giving both parties as much time/information as possible.
The deck that is built might not suit the player...
It might be too difficult to use (playtesting helps here, but most players don't do it enough) or not right for the metagame or whatever. The only solution I can think of for this is to put the victim on the design team or something similar to that.
Now for the first idea on this thread, the only thing needed is a system for determining what the topic for each week will be. It's not particularly difficult (a single person could do it with no trouble) and there's no problem with changing the system later if it's more convenient or something. I see no problem with implementing it. The only question then is "are we up for it?" and I'm not sure, myself. I couldn't commit to an article a week, but maybe we have enough writers who can...
Continuing off SeFRo's list...
Can enough ever be said about Elven Ranger? I don't think I even have it anymore. I have the one with the
other artwork instead. I need to remember to get the RIGHT one, just for the novelty. While Elven Ranger is perhaps the most blatant (come on, I don't think there's anyone who would try to say that she's rangerlike) look closely at Gift of the Woods (the artwork, and yes, the female version of course). What, was that supposed to be an accident?
Now, continuing off Killer Joe's list...
Combo week
Budget week
Block format weeks (there are 9 of them now)
Type II week (ugh)
Type I week
Control week
Type 1.5 week
Unglued week
Relentless Pony week
Blue week (starring Train)
Goblins week (and all the other creature types really)
Peasant week
"Infinite" week
Enchantment week (artifact week, creature week, whatever)
Homelands week (should be for the crappiest week of the year)
Portal week (for an even worse week)
Snow-covered week
Counterspell week (or any individual card Train dislikes)
WotC sucks week
5-color deck week (not the format)
Extended week (the format)
Aggro week
Lockdown week (on decks that lockdown the game, silly)
Toolbox week
play variants week
two-headed giant week
S&M week (sorry, SeFRo's gotten to me)