Dimir Keyrune + Cipher

[natesmith]

If I encode a cipher spell onto a Dimir Keyrune I have on the field that's a monster, does it keep the cipher, or do the effects go away when at the end of turn the Keyrune returns to being an artifact?

[Drunk Cynic]

It stays there, even after the permanent ceases to be a creature. From the rules:

702.98c. The card with cipher remains encoded on the chosen creature as long as the card with cipher remains exiled and the creature remains on the battlefield. The card remains encoded on that object even if it changes controller or stops being a creature, as long as it remains on the battlefield.

[natesmith]

Thank you