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Magma Pummeler enters the battlefield with X +1/+1 counters on it.
If damage would be dealt to Magma Pummeler while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from it. When one or more counters are removed from Magma Pummeler this way, it deals that much damage to any target.
If an amount of damage would be dealt to Magma Pummeler greater than the number of +1/+1 counters on it, all of that damage is prevented, and all of those counters are removed. In most cases, this will result in Magma Pummeler having 0 toughness, so it will be put into its owner's graveyard. Its reflexive triggered ability still triggers and it will still deal that much damage to any target.
