Pots look like this:
It's unlikely, but it's possible that someone's schedule could face Real Madrid and Manchester City from Pot 1 and Leverkusen and Arsenal from Pot 2… facing 3 of Top 5 league champs and the EPL runner-up. Add in PSV, Sporting, Stuttgart and Villa from pots 3 and 4 and that's a hellacious schedule. (Edit, actually Villa would be impossible here… a team can't draw 2 from the same country).
On the flip side, someone could draw a schedule as easy as: Leipzig, Dortmund, Brugge, Shakhktar, Crvena, Young Boys, Bratislava, Strum Graz.
Both extremes are unlikely but possible. Anyone want to wager if RM gets the latter?