Hello,
Thank you for making a bug report.
Chances are you are using either the Local or the Test hand modes which is using an older version of the core. 3 days ago card that contain Tributing were affected by a change another team made that broke Omega’s core. The online core was able to be repaired and functions at this current time. But until the team forces a massive download on EVERYONE, the local and test hand core will still be broken.
We apologize for this inconvenience, but you can still perform the same testing by going online and hosting a private room and inviting the ai of your choice to the room.
If you have any questions, please feel free to reach out to us on the #Omega_help channel in the Duelist Unite discord server.