Rule 712.18 · Double-Faced Cards

When a 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 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.