Carrier of Pestilence

Contagious (Carrier of Pestilence enters the battlefield with an contagion counter on it. Whenever
it deals damage to a creature, put an contagion counter on that creature and it gets contagious.)
At the beginning of each player's upkeep, this player gets X poison counters, where X is the number of contagion counters on creatures he or she controls.
{1}{b/g}: Regenerate Carrier of Pestilence.