I am not opposed to Alchemy or Historic being a unique digital only format, but an eternal format where cards are unchanged needs to be implemented on Arena. Pioneer and/or Modern being the most logical. It could even be another unique format (Pioneer plus fetch lands because shuffling isn’t an issue in digital) like Historic was prior to the digital only cards. But consistency with paper cards and allowing cards to live on post-standard rotation is something that a significant portion of the player base wants, and I believe is necessary for the long-term health of MTGA.