![1](/Handlers/Image.ashx?size=small&name=1&type=symbol)
![Variable Colorless](/Handlers/Image.ashx?size=small&name=X&type=symbol)
,
![Tap](/Handlers/Image.ashx?size=small&name=tap&type=symbol)
: Target opponent puts cards from the top of his or her library into his or her graveyard until a creature card or X cards are put into that graveyard this way, whichever comes first. If a creature card is put into that graveyard this way, sacrifice Helm of Obedience and put that card into play under your control. X can't be 0.