Rule 701.24g

If an effect would cause a player to shuffle a library at the same time that an object would be put into a certain position in that library, the result is a shuffled library that’s randomized except that the object is in the specified position. Example: Darksteel Colossus and Gravebane Zombie are put into a player’s graveyard from the battlefield at the same time. Darksteel Colossus says in part “If Darksteel Colossus would be put into a graveyard from anywhere, reveal Darksteel Colossus and shuffle it into its owner’s library instead.” Gravebane Zombie says “If this creature would die, put it on top of its owner’s library instead.” The player shuffles Darksteel Colossus into their library and puts Gravebane Zombie on top of that library.