Priest of Decay

{1}{b}{b}, {t}: Target creature gains Encasing 3 until end of turn. (When this creature deals damage to another creature, that creature gains three encasement counters. At the beginning of your upkeep, remove an encasement counter from all creatures with encasement counters on them. If they would lose all their encasement counters this way, exile that creature.)
{r}{r}, {t}: Priest of Decay deals 4 damage to target creature with an encasement counter on it.