I've set up a command on Butler Bot to copy a card on board 'Team Tasks' when someone is tagged and create it on another board of their name. Is it possible for that copied card to keep updating every time the original card is changed in some way? I.e if a comment is added on one, its added on the other?
I can't speak to if this is possible via Butler, but I can tell you that Trello doesn't support any card mirroring or syncing features, unfortunately. There are a few third-party Power-Ups that are dedicated to keeping cards in sync, which you can read more about here:
Board Sync by Unito
As @mikelj stated, you can accomplish this using Unito's Board Sync power-up! Here are two great resources that'll help you understand what Unito does with Trello a bit more. Hopefully you find them useful!
Trello + Trello Integration w/ Unito (http://bit.ly/2ZXqwhe)
How to Create a Master Board in Trello Webinar/Tutorial (http://bit.ly/2OB4oIa)
Let me know if you have any more questions, or need any help.
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