{X}, {T}: Target opponent mills a card, then repeats this process until a creature card or X cards have been put into their graveyard this way, whichever comes first. If one or more creature cards were put into that graveyard this way, sacrifice Helm of Obedience and put one of them onto the battlefield under your control. X can't be 0.
NM-Mint - $28.60
Lightly Played - $25.80
Moderately Played - $22.90
Heavily Played - $20.10
Damaged - $14.30
NM-Mint Non English - $28.60
Lightly Played Non English - $25.80
Moderately Played Non English - $22.90
Heavily Played Non English - $20.10
Damaged Non English - $14.30