Helm of Obedience

Artifact    (CMC:4)

, : Put the top card of target opponent's library into his or her graveyard. Continue doing this until you have put X cards or a creature card into that graveyard, whichever occurs first. If the last card put into the graveyard is a creature card, bury Helm of Obedience and put that creature into play under your control as though it were just cast. X cannot be equal to 0.

AL • ENBrian Snoddy

™ & © 1993—1996 Wizards of the Coast

Legal in: Ice Age Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Helm of Obedience {4} Artifact {X}, {T}: 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 onto the battlefield under your control. X can't be 0.

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View this MTG card on Gatherer

10/1/2008
You put the creature card onto the battlefield even if you can't sacrifice Helm of Obedience (because it's left the battlefield by the time its ability resolves, for example).
10/1/2008
If an effect like that of Leyline of the Void prevents cards from being put into your opponent's graveyard, the process described in the first sentence of Helm of Obedience's effect will never stop. Your opponent's entire library will be exiled, even if X is 1.

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Card Helm of Obedience is not on TCGPlayer.