Historical Rules · 13 October 2023
Rule 712.18
Official source text from the 13 October 2023 Rules release
When a transforming double-faced permanent transforms or converts, it doesn’t become a new object. Any effects that applied to that permanent will continue to apply to it. Example: An effect gives Village Ironsmith (the front face of a transforming double-faced card) +2/+2 until end of turn and then Village Ironsmith transforms into Ironfang. Ironfang will continue to get +2/+2 until end of turn.