It's hard to judge Magic expansions for chaos drafting. The appeal of chaos drafting is that of randomness and possibility, and so every single Magic expansion has something good to offer. And chaos drafting is highly dependent on context. Drafting Khans of Tarkir with Magic Origins will feel fairly different from Khans of Tarkir with Invasion. So we can evaluate expansions in a vacuum—sheer power level of individual cards—while also taking into account the relative power of a single booster. Now, generally when chaos drafting you won't use but a couple of boosters from some expansions, so while it's useful to know how archetypes work within a certain environment (because of possible pointers you might get for building a better deck), in the end the most important part is knowing what you can do with a couple of random packs. So don't count on getting an Elesh Norn, but maybe you can hope for a Serra Angel! One good thing about Iconic Masters is that rares will general...