Red Magic

{r}{r}{r}{r} Roll a D20: (activate this ability only
once per turn)
•1: Put a -1/-1 counter on a creature you control.
•2-12: Put a -1/-1 counter on target creature.
•13-19: Put a -1/-1 counter on target creatures
for as many Demons you control.
{bull}20: Put three -1/-1 counters and three +1/+1 counters on target creatures, then proliferate.