As of posting, it is literally impossible to play a Limited Rebalanced deck through any means on the client, specifically via direct/friend challenges. This means that you can build a deck you cannot play.

This is a critical issue for people developing cubes for Arena that use these cards. It is literally impossible to play a cube that uses certain digital cards in paper, but it is also literally impossible to play a cube that uses digitally rebalanced cards on Arena, the only place they formally exist. Cubes are some of the most popular ways to play Magic, and they drive demand for people to craft and play cards that otherwise might not see play anywhere else. I am developing an Arena Cube intended for a large Discord server right now, and it is impossible to playtest because of this issue.

I can't say anything definitive, I obviously don't know your codebase, but adding a "40 card Rebalanced" option to "Challenge Match" and/or adding a "Rebalanced Limited Cards" option to "Limited Tournament Match" should take under an hour of dev time, given the format is already supported as a type, and would make a MASSIVE, outsized impact to players looking to Arena cube like myself.