Noble Hierarch [Judge Gift Cards 2012] Emblem Creatures can't attack you unless

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you

Whereas Mishra works in metals and stone

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

Set: Revised Edition Type: Creature — Bird Rarity: Rare Cost: {G} Flying

Noble Hierarch [Judge Gift Cards 2012] Emblem Creatures can't attack you unlessSet: Judge Gift Cards 2012 Type: Creature Human Druid Rarity: Rare Cost: {G} Exalted (Whenever a creature you control attacks alone, that creature gets +1 +1 until end of turn.) {T}: Add {G}, {W}, or {U}. She protects the sacred groves from blight, drought, and the Unbeholden.