Enchantment, 3B (4) Whenever a creature is put into your graveyard from play, put that card on top of your library.1 "Think of them not as failures but as works in progress." -Volrath
Illus. Robert Bliss
This is not an optional ability. [Barclay 1998/02/27]
If multiple creatures die at once, you resolve the triggers in the order you choose, so the creatures end up on your library in the order you choose. [Barclay 1998/02/27]