Arktaal, Eternal Anger

Hexproof
At the beginning of your upkeep, each opponent loses X life, where X is the number of anger counters on Arktaal, Eternal Anger. If you own any other Anger Entities, Arktaal, Eternal Anger deal an additional X damage to each opponent equal to the number of other Anger Entities you control.
{t}, pay {p/r}{p/r}{p/r}: Put an anger counter on Arktaal, Eternal Anger.