Backlog Emerge cost is bugged

[Palw]

Screenshot or Video

1. 1 or more

When casting a spell with emerge cost, I can sacrifice the same creature multiple times with "ctrl+Z" and reducing the cost as many times as I want.

https://imgur.com/a/Rh9Jzeh

 

[Neo001992]

Can confirm that you can undo your sacrifice from your Emerge costs and select a sacrifice again to further reduce the generic part of the Emerge cost completely away with repeated undo actions.

https://imgur.com/a/a2ahOo3

Event#268861849 Game#878681426