If you're interested in becoming a playtester for WOTC (and I assume Magic since it doesn't specify), pg. 17 in the latest Top Deck on the Magic side has info. Basically contact Mons Johnson at playtest@wizards.com. It doesn't say if they REALLY need people so don't expect a lot but hey, maybe it's worth a try.
Also has info if you're interested on the artist side or wiriting for Top Deck (Magic or otherwise).
Also has info if you're interested on the artist side or wiriting for Top Deck (Magic or otherwise).