Martyr's Cause 
Enchantment
Sacrifice a creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
Sacrifice a creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.