Muzan, the demon king

indestructible, hexproof, infect, trample
whenever a creature an opponent control dies,
that player gains one poison counter, 2 counters
if it died to -1/-1 counters.
demons you control gain +1/+1 and infect.
{b/r}{b/r}{t}:proliferate.
{5}{ut}:each opponent gains 1 poison counter and
each creature they control gains a -1/-1 counter.