That's a neat idea, thanks for sharing it! I'll let the team know that's something you'd like to see in a future version of Trello.
In the meantime, you might want to look into the Custom Fields Power-Up: https://help.trello.com/article/1067-using-the-custom-fields-power-up
With this, you could assign both members to the card as normal, and use a second set of fields to specify who is the Implementer and who is the Reviewer, which might work for your team!
If you had to thrive a new habit during a lockdown, what would it be? Trello
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event