Looking at opponent's sideboard with Mindslaver.

[SuperKikoni]

Will this function ever be implemented? It's sort of one of the tricks-of-the-trade when it comes to the Slaver-lock, and it really helps in adjusting your sideboard for what might come. I imagine it might be difficult, and might need the inclusion of a button that lets you look at your sideboard whilst playing, but a guy can dream.

[LevelX]

https://github.com/magefree/mage/issues/435

The issue already exists, for sure not the most important thing.
But also not very complicated.