Martyr's Bond | Magic: The Gathering
Formats Martyr's Bond is Legal in
Official Oracle Text for Martyr's Bond
—Zedruu the Greathearted
Official Rulings for Martyr's Bond
9/22/2011 : Each opponent must sacrifice only one permanent for each trigger, even if the nonland permanent you controlled that went to the graveyard had multiple types. For example, if an artifact creature you control is put into a graveyard from the battlefield, each opponent sacrifices exactly one artifact or creature, and that permanent doesn't need to be an artifact creature.