Rule 712.19 · Double-Faced Cards
If an effect instructs a player to choose a card name, the player may choose the name of either face of a double-faced card but not both. The player may choose the name of the combined back face of a meld pair.
Ask the judge Pro
The life counter has an AI judge that answers your play citing the exact rules. It is part of Gatewatch Pro; the rules, Oracle text and rulings stay free.