Spinal Plaguebearer

Hexproof, drain
Spinal Plaguebearer can't block as long as it has four or more -1/-1 counters on it.
Spinal Plaguebearer enters the battlefield with a -1/-1 counter for each 1 life paid to cast it.
When Spinal Plaguebearer dies, all creatures get -X/-X where X is the number of -1/-1 counters on it.