Rule 712.13a

Some abilities may cause a double-faced spell with its front face up on the stack to enter the battlefield transformed or converted. If the back face of the card that represents that spell is an instant or sorcery face, or that spell is a copy of a double-faced card created with an instant or sorcery back face, it doesn’t enter the battlefield, and is instead put into its owner’s graveyard. Example: A player controls both Mycosynth Lattice and March of the Machines, the combined effects of which make all permanents artifact creatures in addition to their other types. They also control a Clone on the battlefield that is a copy of Bird Admirer, a creature with daybound. It is currently night, but that permanent can’t transform because it isn’t represented by a double-faced card. Its controller casts Mystic Reflection targeting it, then casts Invasion of Kylem, a Siege battle whose back face is a sorcery. Because Invasion of Kylem is entering the battlefield as a creature, Mystic Reflection’s replacement effect applies to it and it tries to enter the battlefield as a copy of Bird Admirer. Since it is night, the daybound ability would normally cause it to enter with its back face up. However, since its back face is a sorcery, it is instead put into its owner’s graveyard.