I am really inclined to wonder these days if there's some uneven-ness to the probability of getting a particular Top 50 spot to fight against. Reason: I seem to run into 10 men a LOT. Like, in a sitting of 50 or so games I'll see him five times, maybe more. It's not an isolated trend, it's been happening ever since I started farming T50 months and months ago. Which is great, since he VERY often has exactly the card I'm looking for. (Tonight he's been feeding me Morning Stars... whee!)
This warrants a study, perhaps?