Market Price
Raw
$0.10
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Card Details
Cumulative upkeep 
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.
Illustrated by Matt Cavotta
Rulings (4)
Jul 15, 2006
Each target must be assigned at least 1 damage.
Jul 15, 2006
If Magmatic Core has no age counters on it, the only number of targets the ability can have is zero.
Jul 15, 2006
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.
Jul 12, 2019
You can choose zero targets. In this case, Magmatic Core deals no damage.