Helm of Obedience [Alliances] The Biggest All creatures able to block

All creatures able to block enchanted creature do so

Whenever Phyrexian Negator is dealt damage

Set: Champions of Kamigawa Type: Legendary Artifact — Equipment Rarity: Rare Cost: {3} Equipped creature gets +3/+1

sacrifice that many nontoken permanents

Set: Beta Edition Type: Artifact Rarity: Rare Cost: {1} Creatures with power 3 or greater don't untap during their controllers' untap steps

Helm of Obedience [Alliances] The Biggest All creatures able to blockSet: Alliances Type: Artifact Rarity: Rare Cost: {4} {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.