"On a failed save, target creature becomes a pile of fine gray dust."

Fire Covenant

As an additional cost to cast this spell, pay X life.
Fire Covenant deals X damage divided as you choose among any number of target creatures.

Secret Lair Drop

Masters Edition

As an additional cost to play Fire Covenant, pay X life.
Fire Covenant deals X damage divided as you choose among any number of target creatures.

Ice Age

Fire Covenant deals X damage, divided any way you choose among any number of target creatures, where X is equal to the amount of life you pay. Effects that prevent or redirect damage cannot be used to counter this loss of life.

If X is 0, the number of targets must also be 0.

You divide the damage as you cast the spell. You can’t redistribute the damage if any of the target creatures becomes illegal before the spell resolves.

You must distribute at least 1 damage to each target.