Magmatic Core
Enchantment
Cumulative upkeep 
(At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
At the beginning of your end step, this enchantment deals X damage divided as you choose among any number of target creatures, where X is the number of age counters on it.
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Printings (1)
Rulings (4)
- 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.