Mask Tokens
This design document was once relevant, but was deemed unsatisfactory before being implemented into Ephemeral Space.
The following reason was given for its removal: "Extracted from mask document. Mask tokens kind of directly conflict with Masquerades. You can't both pick your own mask, and also have a focused game style in play. We still want some metaincentives for objective stuff but not like this."
At the end of a round, if you've successfully complete your objectives, you receive a mask token that's associated with your account. Between rounds, a few round's worth of tokens can be redeemed to pre-select your mask before the round begins.
This provides an incentive for completing mask objectives (to earn tokens) as well as a way to occasionally mitigate randomness.