First, thank you for all that you do for the community. You are a role model for aspiring judges! My question is: if Mairsil the Pretender gains the activated ability of Riptide Replicator, and acquired some charge counters through other means, will Riptide Replicator's ability be able to produce tokens, even though a creature type and color were never chosen?
Mairsil doesn’t have Riptide Replicator’s “choose a color and creature type” ability. When Mairsil uses Riptide Replicator’s ability, there’s no color or type chosen and so the token will be colorless with no creature types.











