Magmatic Core
Coldsnap — uncommon
Enchantment
Magmatic Core rulings:
2019-07-12: You can choose zero targets. In this case, Magmatic Core deals no damage.
2006-07-15: The damage is divided when Magmatic Core’s ability triggers. Increasing or decreasing the number of age counters on Magmatic Core after the ability triggers but before it resolves has no effect on the amount of damage that’s dealt.
2006-07-15: If Magmatic Core has no age counters on it, the only number of targets the ability can have is zero.
2006-07-15: Each target must be assigned at least 1 damage.