Rabbit Scribe, I'd like to know why you're so fascinated with cards that do things before the game starts and/or affect mulligans.
Because I really suck at playing Magic, so any effect that randomizes the game significantly enhances my chances of winning! Also, my deck designing skills are similarly lame, so I have a lot of experience with mulligans...
OK, OK, I dunno. It's just something different, that's all. I hadn't really thought about the issue raised above- "If serum powder was playable, would that be good for the game?" Point taken, and anyway everybody seems to hate monkeying with mulligans, so I'll give it up. Thanks for the input, all...